CN206157074U - Novel xylol and recovery of acetic acid waste gas device - Google Patents

Abstract

The utility model relates to a novel xylol and recovery of acetic acid waste gas device and method, include and spill over condensing recovery unit and the absorption formula recovery unit that the direction communicates in proper order along acetic acid and xylol mist, condensing recovery unit is including the one -level condenser, the second grade condenser that communicate in proper order, second grade condenser lower extreme is provided with the condensate recovery jar. The utility model has the advantages of: the recycle of organic matter such as acetic acid and xylol is rateed up to more than 99%, and the regeneration of active carbon is thorough, and reuse rate is high, long service life, and the running cost is low, has both practiced thrift the energy and has also simplified technology to do not adopt steam regeneration.

Description

A kind of retracting device of new dimethylbenzene and acetic acid waste gas

Technical field

The utility model is related to a kind of water treatment agent, metal conditioner, electron trade cleaning agent, household chemicals and adds Plus the retracting device of agent field, more particularly to a kind of new dimethylbenzene and acetic acid waste gas.

Background technology

Polyisobutylene phosphate be integrate scale inhibition, dispersion, inhibition, etc. multiple performance water treatment agent, using front Scape is extensive.The special nature that it has so as in industrial circulation water treatment, oil-field flooding, mesohigh boiler have special use On the way.For current production technology, in its preparation process, because pyroreaction can produce a large amount of dimethylbenzene and acetic acid gaseous mixture Body.

The organic matter such as dimethylbenzene and acetic acid is important industrial chemicals, is also the important component part of fuel, while many It is also required to use the organic matters such as acetic acid, dimethylbenzene in the enterprise production process such as chemical industry synthesis, medical agrochemical, coating coating, printing Use as solvent or reaction raw materials.Because the volatility of the organic matters such as acetic acid, dimethylbenzene is stronger, in chemical plant, dye cloth A large amount of places using aromatic hydrocarbons organic matters such as acetic acid, dimethylbenzene such as factory and coating factory, contain substantial amounts of toluene, dimethylbenzene in air Deng aromatic hydrocarbons organic matter；In using organic matters such as acetic acid, dimethylbenzene as the chemical process of raw material, the acetic acid that do not react completely, The organic matters such as dimethylbenzene can be discharged in reaction emptying process.Wherein the organic exhaust gas such as acetic acid and dimethylbenzene content from hundreds of ppm to Ppm up to ten thousand, if effectively not reclaimed to organic matters such as acetic acid therein, dimethylbenzene, the loss for both having caused material is tight Weight, and severe contamination is caused to environment, can also endanger the healthy of operating personnel.

At present the conventional method of the recycling of the organic matter such as Dichlorodiphenyl Acetate or dimethylbenzene have condensation method, combustion method, absorption process, Absorption method and membrane separation process etc..Chinese patent discloses CN101683570A and discloses a kind of toluene recycling and processing device, mainly by Depth cooling step by step carries out refrigerated separation to toluene, and freezing energy consumption is higher in running, and dropping a hint after freezing separation Corresponding discharge standard can not be reached, directly emptying still results in environmental pollution and waste of material, while containing vinegar in unstripped gas It is inapplicable when the organic concentration such as acid or dimethylbenzene is relatively low；Combustion method is vented again after the burning of catalyst auxiliary material gas, very Easily because burning is insufficient to cause environmental pollution, also atmosphere can be made while CO2 being produced in combustion process and being put in air Into destruction, the unstripped gas of low concentration is not applied to；Absorption process is had using corresponding reagent to acetic acid or dimethylbenzene in unstripped gas etc. Machine thing carries out chemical reaction, and whole process is irreversible, it is impossible to carry out the organic matters such as effective recovery of acetic acid or dimethylbenzene, while acetic acid Can only absorb incomplete 90% or so with the absorptivity of the organic matter such as dimethylbenzene, emptying yet suffers from environmental pollution；It is Chinese special The open CN101077850A of profit discloses a kind of method of recovery toluene, i.e., adsorbed using normal pressure, the side of steam desorption and regeneration Formula, because atmospheric pressure state work, causes corresponding absorption and cooling device larger, takes up an area extensively, invests larger, simultaneously because using steaming Vapour regenerates, and containing water and other impurities in the liquid such as recovery of acetic acid, dimethylbenzene, recovered liquid also needs to stratification even rectifying etc. Just available after process, the rate of recovery such as acetic acid, dimethylbenzene is low, can only achieve 85% or so；Membrane separation process is existed using gas composition The difference of infiltration rate realizes the separation of mixed gas on hollow-fibre membrane, and pressure is the power of gas infiltration, it is therefore desirable to compared with Big pressure reduction, needs to be added to higher pressure before film, and without pressure after film, energy loss is larger, and operation energy consumption is higher, while mixed The every kind of component closed in gas is permeable, drops a hint and is unable to qualified discharge, and the service life of film is very short, and replacement cost is very It is high.In sum the organic recovery device generally existing such as at present conventional acetic acid and dimethylbenzene such as invest it is big, take up an area it is wide, Use condition is harsh, the rate of recovery is low, operating cost is high, discharge index is unqualified, automaticity is low, service life is short etc. lacks Fall into.

Utility model content

The technical problems to be solved in the utility model be to provide it is a kind of for above technical problem, especially existing acetic acid and The shortcoming of the organic matter recovery technology such as dimethylbenzene, there is provided a kind of process is simple, safe, good separating effect, product recovery rate Height, low equipment investment, operation and maintenance cost are low, high degree of automation, adapt to it is various operation operating modes new dimethylbenzene and The retracting device of acetic acid waste gas.

To solve above-mentioned technical problem, the technical solution of the utility model is：A kind of new dimethylbenzene and acetic acid waste gas Retracting device, its innovative point is：The condensing time that direction is sequentially communicated is overflowed including along acetic acid and dimethylbenzene mixed gas Receiving apparatus and absorption type retracting device；

The condensing retracting device includes first-stage condenser, the secondary condenser being sequentially communicated；The secondary condenser Lower end is provided with lime set recycling can；

The absorption type retracting device includes absorption tower and the activated carbon canister being sequentially communicated；Include one in the absorption tower Water mist sprinkling device；The charcoal canister has two for being set up in parallel.

Further, it is granular active carbon in the charcoal canister.

Further, connect after the charcoal canister gas concentration detector.

The utility model has the advantage of：

（1）By the analysis and research of paraxylene and acetic acid physical property, in order to carry out effectively to mixed gas steam Reclaim, using the waste gas recovery scheme of the shallow refrigerated condensation+water mist sprinkling+charcoal absorption of two-stage, condensation portion adopts preliminary condensation The method of+B-grade condensation, the different condensation temperature of per grade of employing simultaneously obtains the condensation of most of dimethylbenzene and acetic acid mixed gas Component, while reducing and preventing condensing unit frosting as far as possible；The dimethylbenzene not also being recovered after condensed and acetic acid mixed gas Formula spray sedimentation is circulated by tail gas absorber, the gas Jing charcoal canisters toward top runaway carry out adsorption treatment, entirely Maintain exhaust emissions concentration to meet environmental protection index requirement in the middle of mixed gas removal process, achieve preferable technique effect；

（2）Pressure, the component scope of application to raw material acetic acid and dimethylbenzene is wider；

（3）The recovery utilization rate of the organic matter such as acetic acid and dimethylbenzene is up to more than 99%, and the regeneration of activated carbon thoroughly, repeats Utilization rate is high, and long service life, operating cost is low, had both saved the energy and also simplify technique, and does not adopt steam regeneration；

（4）The aromatic hydrocarbons organic matter such as toluene and/or dimethylbenzene of recovery purity is high, it is not necessary to which process again is profit capable of circulation With dropping a hint after the process of the utility model retracting device can meet national associated gas discharge standard；

（5）The utility model embodiment passes through careful thin by the way that cryogenic refrigerating unit to be placed in the front end of adsorbent equipment The system design of change, gives full play to the respective advantage of condensing recovery system and absorption type recovery system, improves each device Operational efficiency；Under the premise of the effect for reaching dimethylbenzene and acetic acid liquefaction, adsorption tanks size is greatlyd save, reduce adsorbent Loading, while improve the acetic acid and the dimethylbenzene rate of recovery of whole recovery system, reduces exhaust emissions concentration, and it is qualified to realize Discharge；

（6）According to dimethylbenzene and the physical property of acetic acid, first using the shallow refrigerating plant of two-stage, a large amount of acetic acid and dimethylbenzene are made Waste gas liquefaction is reclaimed, and the liquid paraxylene and acetic acid mixed liquor of recovery proceed to apply mechanically, the acetic acid then just not liquefied and Xylene waste gas are passed through tail gas absorber middle part, are settled by circulating water mist sprinkling device, the low concentration liquid after sedimentation Body carries out biochemical treatment, and unabsorbed mix waste gas are further absorbed, most by the absorbent charcoal adsorber on absorption tower top Eventually, the mixed gas concentration discharged by tail gas absorber is made to reach corresponding discharge standard, qualified discharge.

Description of the drawings

Fig. 1 is that a kind of new dimethylbenzene of the utility model and acetic acid waste gas recovering device reclaim schematic diagram.

Specific embodiment

As shown in figure 1, the utility model discloses the retracting device of a kind of new dimethylbenzene and acetic acid waste gas, including edge Acetic acid and dimethylbenzene mixed gas overflow condensing retracting device and the absorption type retracting device that direction is sequentially communicated；Condensing Retracting device includes first-stage condenser, the secondary condenser being sequentially communicated；Secondary condenser lower end is provided with lime set recycling can；Inhale Attached formula retracting device includes absorption tower and the activated carbon canister being sequentially communicated；Include a water mist sprinkling device in absorption tower；Activity Canister has two for being set up in parallel；It is granular active carbon in charcoal canister；Connect after charcoal canister gas concentration detector.

Using the equipment to be embodied as technique as follows：

Reaction unit is opened, polyisobutylene phosphate is prepared；When reaction temperature reaches 140 DEG C, now there is substantial amounts of two Toluene and acetic acid start backflow.The first order condenser valve being connected with reactor is first turned on, while condensed water is opened, control Condenser interlayer temperature makes substantial amounts of acetic acid and dimethylbenzene mixed vapour be back in reactor at 20 ~ 25 DEG C, meanwhile, open Valve between first-stage condenser and secondary condenser, open secondary condenser cooling water and condenser lower end receives pot valve Door, keeps condenser interlayer temperature at 10 ~ 15 DEG C, makes the dimethylbenzene and acetic acid mixed gas of first-stage condenser spilling cold again Solidifying, condensed liquid enters lime set recycling can；Uncooled mixed gas are entered from tail gas absorber middle part, and absorbing liquid is located at Tail gas absorption tower bottom, opens external valve and circularly enhancing pump, lifts absorbing liquid to water mist sprinkling device, now spray equipment There is water smoke to spray, settle to mixing acetic acid and diformazan benzene gas, be circulated absorption；

The acetic acid and dimethylbenzene mixed gas not settled overflows toward upper strata, and Open valve is right by absorbent charcoal adsorber Mixed gas are further absorbed, and the utility model is standby each other using two charcoal canisters, gas of connecting after charcoal canister Concentration detector, is carried out at regeneration when organic vapor concentrations reach setting value to being currently at the active-carbon bed of adsorbed state Reason, while be switched to another adsorption tanks being adsorbed, remaining tail gas reaches waste gas emission standard.

The recovery utilization rate of the organic matter such as acetic acid and dimethylbenzene is up to more than 99%, and the regeneration of activated carbon thoroughly, repeats profit High with rate, long service life, operating cost is low, had both saved the energy and also simplify technique, and does not adopt steam regeneration.

General principle of the present utility model and principal character has been shown and described above.The technical staff of the industry should Solution, the utility model is not restricted to the described embodiments, and this practicality is new for simply illustrating described in above-described embodiment and specification The principle of type, on the premise of without departing from the utility model spirit and scope, the utility model also has various changes and modifications, These changes and improvements are both fallen within the range of claimed the utility model.The claimed scope of the utility model is by appended Claims and its equivalent thereof.

Claims (3)

1. the retracting device of a kind of new dimethylbenzene and acetic acid waste gas, it is characterised in that：Including along acetic acid and dimethylbenzene mixing Condensing retracting device and absorption type retracting device that gas overflowing direction is sequentially communicated；

The condensing retracting device includes first-stage condenser, the secondary condenser being sequentially communicated；The secondary condenser lower end It is provided with lime set recycling can；

The absorption type retracting device includes absorption tower and the activated carbon canister being sequentially communicated；Include a water smoke in the absorption tower Spray equipment；The charcoal canister has two for being set up in parallel.

2. the retracting device of a kind of new dimethylbenzene according to claim 1 and acetic acid waste gas, it is characterised in that：It is described It is granular active carbon in charcoal canister.

3. the retracting device of a kind of new dimethylbenzene according to claim 1 and acetic acid waste gas, it is characterised in that：It is described Connect after charcoal canister gas concentration detector.