Shallow talk about a pharmaceutical factory method of volatile organic off-gas treatment

Lower the discharge capacity target of volatile organic matter to reach environmental protection section, make the pharmaceutical factory has machinist job waste gas discharge achieve a requirement, the manage of the reason that the author has machinist job waste gas to arise through analysing a pharmaceutical factory and organic industry waste gas changes character, advance the processing principle of organic industry waste gas, use adsorption, absorb, the engineering technology such as catharsis law, condensation handles organic industry waste gas, raised level of organic industry off-gas treatment.

One, the definition of VOCs industry waste gas and harm current situation

VOCs is to point to the floorboard that has volatile organic compound below certain condition. Volatile organic compound basically includes to be not methane acting hydrocarbon of the total hydrocarbon, compound that contain oxygen, bittern, contain nitrification the content, compound that contain sulfur. Regard a manufacturing industry as big country, annual the VOCs that China discharges has exceeded 20 million T, its are absolutely the discharge capacity that discharge capacity wants to compare oxide of 2 oxidation sulfur, nitrogen and dust is high, accordingly, control volatile organic matter discharging is very important to atmosphere environment.

As the promotion of standard of living, the people to living environmental demand is higher and higher also, to this, our country publishs relevant policy code to administer VOCs in succession, be like ” ” 935 ” program of work of prevention and cure of pollution of volatile organic matter ” ” action of air pollution prevention and cure plans ” etc, line of business of chemical industry, pharmacy takes care of bit of superintendency industry to must raise the level that VOCs prevention and cure handles as annulus.

　2, the processing technique of VOCs industry waste gas

Industry of medical chemical industry does not have an organization to volatilize in organic synthesis reaction and storage tank of centrifugal and purificatory, organic matter wait for the meeting below operating mode to arise organic volatilize industrial waste gas. For instance of the tail gas of boiler of the transportation of project of raw material medicine, organic matter, reaction, storage tank put empty.

The tradition of VOCs industry waste gas administers a method

VOCs not only origin is very extensive, and its composition part is very complex also, common volatile organic compound includes hydrocarbon kind, mellow kind, ether kind etc, although to same material, as a result of its wind force, pH indicator differs, requires technical line is endless also and same, accordingly, do not have a kind of technology to be able to solve all VOCs problems. Current, VOCs processing technique has tens of planting, its principle basically has reclaim valuable of solvent reclaim the technology destroys a technology with what decompose VOCs element two kinds big, the more in applying actually uses combined-type technology. The organic industry waste gas that the technology that condense through using for instance and burns to be united in wedlock will come to handle low density, large flow, reduce the investment cost of equipment then.

The new-style processing method of VOCs industry waste gas

Through using catalytic combustion (CO) burn with type of accumulation of heat (RTO) the technology that combines, finish the complete processing of pair of VOCs industry waste gas with less specific power consumption; The manage such as the solubility of basis VOCs oneself, boiling point changes property to select right adsorptive kind. If choose to become lukewarm,adsorption or pressure swing adsorption undertake solvent reclaims, the circumstance basically is produced to choose corresponding adsorptive method according to the enterprise when reclaiming, the article basically introduces the following two kinds of methods.

1) absorption method basically has law of activated carbon adsorption, pressure swing adsorption, condensation and membrane separation technology, basically be to pass sorbent of sex of temperature, pressure, choice and choice sex to soak the physical method such as film to come at present adsorptive and organic volatile material.

2) cleared law has hot oxidation, catalysis to go out, biology oxidation and compositive skill. Its basically are to pass chemical reaction or biochemical reaction, fall in hot, activator or microbial action for instance, change harmful organic thing into hurtless CO2 and H2O.

　3, 4 kinds of typical VOCs handle a technology

1, adsorptive engineering technology

The means that this adsorption technology is the means that shows sorbent is united in wedlock through physics or chemical reaction undertakes adsorption to harmful material, achieve the goal that purifies industrial waste gas then. This technology makes when chroma of organic industry waste gas is inferior appliance has better effect, but unfavorable and direct with this technology processing Gao Nong spends organic industry waste gas, can be after the pattern processing such as condensation, reuse this technology undertakes depurative to industrial waste gas. In adsorptive process, sorbent, equipment, craft, second birth is its key reference point. The sorbent that purifies process middling to use in VOCs at present has inorganic and organic sorbent two kinds, sorbent should choose to vast watch area, good alternative, stronger second birth sex, better thermal stability and chemical stability, larger adsorptive size is waited a moment. The sorbent sort on the market is at present more, commonly usedly activated carbon, element sifts zeolite to wait.

Adsorptive way is right of organic industry waste gas purify relatively complete. Using deep below the method of cold, high pressure, can achieve pair of organic composition to reclaim the end that use, and no matter this method is equipment or operation simpler, have higher automation rate, won’t cause pollution 2 times.

The advantage of craft of activated carbon adsorption applies to processing contaminant of all sorts of low pH indicator. In applying actually, the advantage of activated carbon is: Low, low cost can, economy, acid-proof alkaline, heat-resisting and have very tall chemical stability, and activated carbon is operated in use process very handy, need to connect to be able to produce effect with air only. But activated carbon also is put in certain defect, adsorptive volume is for instance minor, appear easily in use process saturated phenomenon; To sorbent use up bigger, and adsorptive capability is not strong, the meeting after using proper time makes adsorptive quantitative change little, lose adsorptive ability even. Additional, adsorptive concentrated sex problem exists when adsorption, to gas mixture, adsorptive sex will be abate, the desorption appearance that existence is not matched by the molecular diameter of adsorptive material and activated carbon aperture and causes.

2, absorb engineering technology

This principle that absorbs a technology is to will machinist job waste gas and absorbefacient have sufficient contact, come out the harmful corporeal adsorption in industrial waste gas to finish pair of industry waste gas thereby purify processing, its basically are to use the means that physics is absorbed or chemistry reacts to finish. After the adsorption that should finish harmful material, repass desorption keeps clear of the harmful material in sorbent, realize pair of sorbent thereby clean, undertake second birth is used next, more commonly used absorbefacient has acidity solution, clear water to wait.

The dominant position that draws craft is whole system circulate for closed circuit, outside removing vapour condenser water, discharge without liquid waste, waste liquid, vapour condenser water can consider to reclaim integratedly use. This control system used advanced drill to accuse a concept, moving smoothly normally while reduced artificial operation, realized unmanned value to defend truly, move automatically, answering the respect such as effects rate, maneuverability, feebleminded bad news to all reach domestic advanced level.

3, catharsis law engineering technology

This technology is to show waste gas smokes an organic industry to contain gush to drench in systematic washer, after gas passes filling bed undertake OK and even ground, adequately osculatory with catharsis fluid, change character according to the manage of harmful material in industrial waste gas, the means that uses physisorption or the means that chemistry reacts keep clear of contaminant, make organic industry waste gas gets depurative thereby. Besides, washer still has drop in temperature, remove dust, the effect that removes oil.

Solution of natrium of solution of fluid of clear water, plant, vitriolic solution, hydrogenous oxidation natrium, second chloric acid is the scour that catharsis law middling uses, rinse catharsis and plant fluid catharsis basically used contaminant among them the dissolvability in two kinds of solution, in plant fluid a few base the chemical reaction that the group also shared organic matter. Using vitriolic solution, oxyhydrogen to change sodium and natrium of second chloric acid is to pass chemical reaction to come to those who purify to finish to the catharsis of organic industry waste gas, those who use is the chemistry of harmful and organic matter. The characteristic of catharsis law is reaction fast, the osculatory time of scour and harmful gas is shorter, do not exceed 12s commonly; Additional, catharsis law still has very strong applicability, it can be used jointly with other processing techniques, very effective to the pretreatment of organic industry waste gas.

Wash equipment uses vertical structure commonly, basically have the following advantage, it is to take up the space is lesser; 2 it is an operation handy, need lies between those who have catharsis liquid for some time to change; 3 it is use process medium technological process is more agile, if be used at handling different gas, need to change only corresponding catharsis fluid; 4 it is construction cost is low.

4, condensation engineering technology

Below different temperature and pressure, gaseous contaminant has different degree of saturation, condensation craft is based on this principle namely, come to those who accomplish organic thing to condense through reducing the temperature of gaseous contaminant and the pressure that increase contaminant of air entrainment condition, undertake finally depurative reclaiming. To waste gas of industry of those low velocity of flow, tall pH indicator, technology of main use condensation undertakes depurative, and this technology is handling boiling point be more than mark of 36.85 ℃ , bulk to be more than the industrial waste gas of 0.005% particularly effective. But the industrial waste gas to a few inferior boiling point, when undertaking condensation to its, need greater pressure, lower temperature, want to obtain this kind of condition, undoubted meeting costs bigger cost. The efficiency in the process that condensation craft is handling industrial waste gas can get the limitation of temperature and pressure, processing efficiency is so lower, the pretreatment that reason basically uses his at industrial waste gas in applying actually and before class is purified, the gas after processing still needs to handle ability to discharge further, and reclaiming dissolvent also cannot be used directly, need further processing.

The place on put together is narrated, have machinist job waste gas to what pharmaceutical factory place arises, should from fountainhead, medium end and extreme undertake all-around integrated processing to its, choose proper processing engineering technology according to operating condition. Should control from fountainhead and process above all (wait for easy happening to pump, compressor, valve, flange namely the equipment of leak and cop component) undertake detecting regularly, if discover the problem should undertake in time handling to its, achieve thereby reduce and even put an end to happen run, risk, the purpose of drop, leakage; In drug production process, through be opposite airtight, the use of the technology of unifinication and equipment, reduce those who have machinist job waste gas to divulge, undertake collection to industrial waste gas, classification, processing; The VOCs that can collect area of organic menstruum canister to be discharged in the place in the course that takes makings and memory sends reclaim equipment.

Administer to extreme of industrial waste gas then with use integratedly. When chroma of quantity of the pollutant in extreme industry waste gas is inferior, to the industrial waste gas that can reclaim, can undertake reclaiming to organic reagent through adsorption, discharge again after processing; Reclaim to doing not have for the industrial waste gas of value, can adopt a variety of techniques, condense combustion technology, plasma technology or ultraviolet light for instance advanced combustion technology mark is amounted to to discharge after purifying; Be in medium organic industry waste gas to mass concentration, can reclaim through adsorptive will organic dissolvent, next repass catalytic combustion or heating power burn purify industrial waste gas, still can use the quantity of heat that in purifying a process, produces. Spend the industrial waste gas of VOCs industry waste gas to Gao Nong, can wait for a technology to reclaim organic dissolvent through condensation, adsorption, other technology purifies recombine industrial waste gas.