CN207445653U - Sulphur ammonium crystallization recycling energy saver in acrylonitrile process - Google Patents

Sulphur ammonium crystallization recycling energy saver in acrylonitrile process Download PDF

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Publication number
CN207445653U
CN207445653U CN201721457284.2U CN201721457284U CN207445653U CN 207445653 U CN207445653 U CN 207445653U CN 201721457284 U CN201721457284 U CN 201721457284U CN 207445653 U CN207445653 U CN 207445653U
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heater
crystallizer
tank
outlet
sulphur ammonium
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CN201721457284.2U
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张长远
高飞
黄春琴
姜凯
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SHANDONG QILU PETROCHEMICAL ENGINEERING Co Ltd
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SHANDONG QILU PETROCHEMICAL ENGINEERING Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/50Improvements relating to the production of bulk chemicals

Abstract

The utility model is mainly used in acrylonitrile installation thiamine recovery power-saving technology technique,Sulphur ammonium crystallization recycling energy saver in more particularly to a kind of acrylonitrile process,Its device is included through the sequentially connected dilute sulphur ammonium storage tank of pipeline,Preheater,Crystallizer,Heater and condensate tank,Dilute sulphur ammonium feed pump is set between dilute sulphur ammonium storage tank and preheater,Compressor is set between crystallizer top exit and heater,Crystalliser feet outlet connects thickener by slurry delivery pump,The top of the top connection crystallizer of heater,The bottom of heater connects the lower part of heater by circulating pump,Heater forms forced circulation with crystallizer by circulating pump,Condensate tank top sets gas outlet,Bottom connects acrylonitrile installation by condensate delivery pump,Thickener outlet centrifuge,Centrifuge includes liquid outlet and solid outlet,Solid outlet connects packaging kit equipment.High polymer separation is thorough in the utility model saving steam, saving recirculated water and ammonium sulfate solution.

Description

Sulphur ammonium crystallization recycling energy saver in acrylonitrile process
Technical field
The utility model is related to sulphur ammonium crystallization recycling energy savers in a kind of acrylonitrile process, are mainly used in acrylonitrile dress Put thiamine recovery power-saving technology technique.
Background technology
The current main ethylene oxide-hydrogen cyanide of production method (dehydration of 3- hydroxies) method of acrylonitrile, acetylene in the world- Three kinds of hydrogen cyanide method, propylene ammmoxidation process.Ethylene oxide-acrylonitrile purity made from hydrogen cyanide method is higher, but raw material epoxy second Alkane is expensive, and synthesis technology is complicated, therefore after the advent of acetylene-hydrogen cyanide method, that is, is eliminated.Acetylene-hydrogen cyanide method has gas Two kinds of phase method and liquid phase method, the latter is better than the former, and obtains commercial Application.This method is simpler than ethylene oxide-hydrogen cyanide method, cost compared with It is low, but the raw material calcium carbide of acetylene need to consume substantial amounts of electric energy, therefore limited by electric power resource and environmental protection.Propylene, ammonia oxidation Have many advantages, such as that raw material is easy to get, product cost is low, technical process is simple, capital expenditure saves therefore rapidly instead of other tradition sides Method, acrylonitrile installation in the world is generally using propylene, ammonia oxidation at present.While propylene, ammonia oxidation production acrylonitrile, By-product hydrogen cyanide, acetonitrile and sulphur ammonium.Wherein, the ammonium sulfate solution of 20% or so concentration of acrylonitrile installation upstream by-product, generally use Evaporative crystallization technique, by-product thiamine fertilizer.The sulphur ammonium unit of acrylonitrile installation produces sulphur using single effect evaporation crystallization technique earliest Ammonium fertilizer.Two-effect evaporation crystallization technique was developed to later, two-effect evaporation crystallization technique is than single effect evaporation crystallization technique energy consumption significantly It reduces.But steam is needed to consume a large amount of steam as heat source.Operating cost is still high, energy-saving effect unobvious.
Utility model content
The technical problems to be solved in the utility model is:There is provided a kind of operating cost significantly reduces, and energy saving aspect has great It breaks through, meanwhile, the high polymer isolated from sulphur ammonium liquid does not carry sulphur ammonium so that acrylonitrile installation waster water incinerator is burning height It is more environmentally-friendly during polymers, sulphur ammonium crystallization recycling energy saver in the acrylonitrile process of more preferable environmental protection.
Sulphur ammonium crystallization recycling energy saver in acrylonitrile process described in the utility model, including being sequentially connected by pipeline Dilute sulphur ammonium storage tank, preheater, crystallizer, heater and condensate tank, set between dilute sulphur ammonium storage tank and preheater dilute sulphur ammonium into Material pump, sets compressor between crystallizer top exit and heater, crystalliser feet outlet is connected thick by slurry delivery pump Thick device, the top of the top connection crystallizer of heater, the bottom of heater connect the lower part of heater by circulating pump, heating Device forms forced circulation with crystallizer by circulating pump, and condensate tank top sets gas outlet, and bottom is connected by condensate delivery pump Acrylonitrile installation, thickener outlet centrifuge, centrifuge include liquid outlet and solid outlet, and solid outlet connection is complete Packaging facilities.
Dilute sulphur ammonium comes from acrylonitrile installation.
Overflow port, overflow port connection mother liquor tank, the liquid outlet connection mother liquor of centrifuge are set at the top of the thickener Tank, mother liquor tank connect the bottom of heater by saturated solution feed pump.
Polymer exit is set in the middle part of the crystallizer, and polymer exit connects polymer by saturation liquid pump and separates Tank, polymer separation tank bottom portion set polymer exit and ammonium sulfate solution to export respectively, polymer exit connection polymer buffer Tank, polymer buffer pot bottom by polymer delivery pump connect waster water incinerator, ammonium sulfate solution outlet mother liquor surge tank, Mother liquor surge tank pumps the bottom of connection heater by mother liquor.
There is special structure in the middle part of crystallizer --- " armpit structure ", the organic matters such as polymer can be assembled since proportion is small At " armpit structure ", 6 interfaces are uniformly opened in 360 ° of a circle scopes, 6 interfaces extract the organic matters such as polymer out, and carry Substantial amounts of sulphur ammonium liquid.It takes over to converge for 6 and is pumped to polymer knockout drum for a pipeline desaturation liquid, polymer knockout drum uses House journal " high-efficiency layered separator of acrylonitrile unit " technology, can thoroughly separate polymer and sulphur ammonium liquid, prevent sulphur ammonium Liquid removes incinerator, reduces the discharge of sulfide.
Diluted thioamine liquid is preheated by preheater, and the solution after preheating is sent in crystallizer.It is at the initial stage of driving, it is necessary to outer Portion provides middle pressure steam as heat source.Middle pressure steam removes heater, heats ammonium sulfate solution, and the water vapour of vaporization is from crystallizer top row Go out, water vapour its pressure, temperature after compressor compresses have rise, and compressed steam is dense as the heat source heating of heater Contracting sulphur ammonium liquid.Steam is condensed in the heater, and lime set goes acrylonitrile installation reuse as chilled water (chw);Solution pumps in crystallizer Forced circulation is returned in crystallizer after heated device, ammonium sulfate in heater with compressed steam heat-exchanging, required for acquisition Heat achieve the purpose that evaporation and concentration, while steam is condensed.It is heat source that middle pressure steam is not required during normal production, therefore can To save steam and recirculated water.
A small amount of polymer in sulphur ammonium liquid, micro acrylonitrile, acetonitrile and hydrogen cyanide are assembled at the top of crystallizer outer layer, And it separates.The polymer solution isolated still containing part ammonium sulfate solution, is sent to the separation of polymer knockout drum, polymerization Object adds in a certain amount of chilled water (chw) (from sulphur ammonium liquid from the overflow of separator top to polymer buffer tank in polymer buffer tank In the water that steams) send to burning after dilution;The ammonium sulfate solution isolated from separator bottom, which is sent back in heater, continues evaporation knot It is brilliant;
After sulphur ammonium liquid after concentrate is transported to thickener continuation enrichment, product solid ammonium sulfate is obtained through centrifuge dewatering Grain;Ammonium sulfate products are sent after being sent into packaging kit machine packaging to warehouse.
The beneficial effects of the utility model are:
1st, steam is saved:A small amount of steam only is needed when sulphur ammonium unit is driven, as unit starting heat source.During normal production Need only to external a small amount of steam.During normal production, the steam of ammonium sulfate solution evaporation is by compressor compresses, to improve steam Pressure and temperature improves the steam of pressure and temperature as heat source, to evaporate ammonium sulfate solution.
2nd, recirculated water is saved:Common thiamine recovery technology is, it is necessary to cycle using single-action or two-effect evaporation crystallization technique Water is as low-temperature receiver, to condense the steam evaporated from sulphur ammonium liquid.This technique the steam evaporated in sulphur ammonium liquid through overcompression, Its temperature and pressure is improved, and heat source is used as to evaporate ammonium sulfate solution, itself becomes condensate liquid, is not required recirculated water cold It is solidifying.
3rd, high polymer separation is thorough in ammonium sulfate solution:In the ammonium sulfate solution of 20% or so concentration of acrylonitrile installation upstream by-product There is a small amount of high polymer, these high polymers needs are separated.The benefit separated is:First, sulphur ammonium quality is improved; Second is that the waster water incinerator of acrylonitrile installation can be removed as fuel, it can be energy saving.Pervious high polymer separation is always not thorough, Some ammonium sulfate solutions are carried, so when burning high polymer, the sulphur ammonium of carrying is burned together, sulfur dioxide (SO2) is generated, to cigarette The processing of gas makes troubles.This thiamine recovery power-saving technology can be completely separated the high polymer in ammonium sulfate solution (including acrylonitrile Wait organic matters).
Description of the drawings
Fig. 1 is the structure diagram of the utility model.
In figure:1st, preheater;2nd, crystallizer;3rd, compressor;4th, circulating pump;5th, heater;6th, condensate tank;7th, polymer point From tank;8th, polymer buffer tank;9th, thickener;10th, centrifuge;11st, mother liquor tank;12nd, packaging kit equipment;13rd, waste water incineration Stove;14th, saturated solution feed pump;15th, polymer delivery pump;16th, mother liquor surge tank;17th, mother liquor pumps;18th, condensate delivery pump; 19th, saturation liquid pump;20th, slurry delivery pump;21st, acrylonitrile installation;22nd, dilute sulphur ammonium feed pump;23rd, dilute sulphur ammonium storage tank.
Specific embodiment
The utility model is described further below in conjunction with the accompanying drawings:
As shown in Figure 1, sulphur ammonium crystallization recycling energy saver in acrylonitrile process described in the utility model, including passing through pipe The sequentially connected dilute sulphur ammonium storage tank 23 in road, preheater 1, crystallizer 2, heater 5 and condensate tank 6, dilute sulphur ammonium storage tank 23 and preheating Dilute sulphur ammonium feed pump 22 between device 1 is set, compressor 3,2 bottom of crystallizer are set between 2 top exit of crystallizer and heater 5 Outlet connects thickener 9, the top of the top connection crystallizer 2 of heater 5, the bottom of heater 5 by slurry delivery pump 20 The lower part of heater 5 is connected by circulating pump 4, heater 5 forms forced circulation, condensate tank 6 with crystallizer 2 by circulating pump 4 Top set gas outlet, bottom by condensate delivery pump 18 connect acrylonitrile installation 21,9 outlet centrifuge 10 of thickener, Centrifuge 10 includes liquid outlet and solid outlet, solid outlet connection packaging kit equipment 12.9 top of thickener sets overflow Mouthful, overflow port connection mother liquor tank 11, the liquid outlet of centrifuge 10 connects mother liquor tank 11, and mother liquor tank 11 passes through saturated solution feed pump The bottom of 14 connection heaters 5.2 middle part of crystallizer sets polymer exit, and polymer exit is connected poly- by saturation liquid pump 19 Object knockout drum 7 is closed, 7 bottom of polymer knockout drum sets polymer exit and ammonium sulfate solution to export respectively, polymer exit connection Polymer buffer tank 8,8 bottom of polymer buffer tank connect waster water incinerator 13 by polymer delivery pump 15, and ammonium sulfate solution goes out Mouth connection mother liquor surge tank 16, mother liquor surge tank 16 pass through the bottoms of 17 connection heaters 5 of mother liquor pump.
Processing step is as follows:
1) from extraneous next diluted thioamine liquid into dilute sulphur ammonium storage tank 23, sent through dilute sulphur ammonium feed pump 22 into preheater 1 in advance Heat is to 104 DEG C;
2) ammonium sulfate solution after preheating enters crystallizer 2,2 basidixed of crystallizer into steam, after 3 Pressurized-heated of compressor Supply heater 5 as heat source, the lime set of heater 5 is sent to condensate tank 6,6 gas phase of condensate tank after emptying condenser condensation not Solidifying gas removes washer of dropping a hint, condensate liquid sent through condensate delivery pump 18 to 21 reuse of acrylonitrile installation or as flushing water send to Each user is rinsed;
3) ammonium sulfate solution is cycled through circulating pump semi-finals system, and ammonium sulfate solution is sent into after heater 5 heats and returns to crystallizer 2, is tying The vapor of vaporization is isolated in brilliant device 2, generation steam removes compressor 3, utilized after being compressed as heat source;
4) after 2 bottom slurry of crystallizer is sent into 9 crystallisation by cooling of thickener by slurry delivery pump 20, centrifuge 10 is flowed into certainly, Through being centrifuged at a high speed, isolate solid ammonium sulfate and go packaging kit equipment 12, packed sulphur ammonium is obtained after packaging kit equipment 12 Product.
The mother liquor that the mother liquor and centrifuge 10 that 9 top overflow of thickener goes out in step 4) are isolated flows into mother liquor tank 11 certainly, Re-evaporation in heater 5 is returned with saturated solution feed pump 14 to crystallize.
2 middle part extraction polymer of crystallizer, and sulphur ammonium liquid is carried, sulphur ammonium liquid is saturated liquid pump 19 and send to polymer knockout drum 7, the polymer isolated removes polymer buffer tank 8, and waste water incineration is sent to through polymer delivery pump 15 after stirring;Polymer separates The ammonium sulfate solution isolated in tank 7 enters mother liquor surge tank 16, and being transported to heater 5 through mother liquor pump 17 continues evaporation knot It is brilliant.

Claims (3)

1. a kind of sulphur ammonium crystallization recycling energy saver in acrylonitrile process, it is characterised in that:Including sequentially connected by pipeline Dilute sulphur ammonium storage tank (23), preheater (1), crystallizer (2), heater (5) and condensate tank (6), dilute sulphur ammonium storage tank (23) and preheating Dilute sulphur ammonium feed pump (22) between device (1) is set, compressor (3) is set between crystallizer (2) top exit and heater (5), Crystallizer (2) outlet at bottom connects thickener (9), the top connection crystallizer (2) of heater (5) by slurry delivery pump (20) Top, the bottom of heater (5) connects the lower part of heater (5) by circulating pump (4), and heater (5) is logical with crystallizer (2) It crosses circulating pump (4) and forms forced circulation, gas outlet is set at the top of condensate tank (6), and bottom connects third by condensate delivery pump (18) Alkene nitrile device (21), thickener (9) outlet centrifuge (10), centrifuge (10) include liquid outlet and solid outlet, Gu Body outlet packaging kit equipment (12).
2. sulphur ammonium crystallization recycling energy saver in acrylonitrile process according to claim 1, it is characterised in that:Thickener (9) top sets overflow port, overflow port connection mother liquor tank (11), the liquid outlet connection mother liquor tank (11) of centrifuge (10), mother Flow container (11) connects the bottom of heater (5) by saturated solution feed pump (14).
3. sulphur ammonium crystallization recycling energy saver in acrylonitrile process according to claim 1, it is characterised in that:Crystallizer (2) middle part sets polymer exit, and polymer exit connects polymer knockout drum (7), polymer point by saturation liquid pump (19) From tank (7) bottom polymer exit and ammonium sulfate solution is set to export respectively, polymer exit connection polymer buffer tank (8) gathers It closes object surge tank (8) bottom and waster water incinerator (13), ammonium sulfate solution outlet mother liquor is connected by polymer delivery pump (15) Surge tank (16), mother liquor surge tank (16) pump the bottom of (17) connection heater (5) by mother liquor.
CN201721457284.2U 2017-11-03 2017-11-03 Sulphur ammonium crystallization recycling energy saver in acrylonitrile process Active CN207445653U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107670323A (en) * 2017-11-03 2018-02-09 山东齐鲁石化工程有限公司 Sulphur ammonium crystallization recovery energy saving technique and device in acrylonitrile process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107670323A (en) * 2017-11-03 2018-02-09 山东齐鲁石化工程有限公司 Sulphur ammonium crystallization recovery energy saving technique and device in acrylonitrile process

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