CN100460312C - Method of preparing hydrochloric acid using TDI byproduct hydrogen chloride gas and its device - Google Patents
Method of preparing hydrochloric acid using TDI byproduct hydrogen chloride gas and its device Download PDFInfo
- Publication number
- CN100460312C CN100460312C CNB2006101530496A CN200610153049A CN100460312C CN 100460312 C CN100460312 C CN 100460312C CN B2006101530496 A CNB2006101530496 A CN B2006101530496A CN 200610153049 A CN200610153049 A CN 200610153049A CN 100460312 C CN100460312 C CN 100460312C
- Authority
- CN
- China
- Prior art keywords
- absorption tower
- hydrochloric acid
- hydrogen chloride
- chloride gas
- tower
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The present invention provides a process for preparing concentrated hydrochloric acid by utilizing TDI by-product hydrogen chloride gas and its equipment, belonging to the field of chemical technology, and is aimed at solving the problem of recovering and utilizing TDI by-product hydrogen chloride gas. It is characterized by that said invention adopts two-stage absorption tower and uses process water to absorb hydrogen chloride gas, and utilizes the circulation loop consisting of absorption tower, circulation cooler and hydrochloric acid circulation pump to make mass circulation absorption of hydrochloric acid and increase its concentration so as to obtain the invented concentrated hydrochloric acid.
Description
Technical field
The present invention relates to a kind of processing method and device thereof that utilizes chemical industry waste gas to prepare industrial chemicals of technical field of chemistry, the especially a kind of TDI of utilization byproduct hydrogen chloride gas prepares the processing method and the device thereof of hydrochloric acid.
Background technology
Along with the growing and continuous progress in science and technology of chemical industry, the comprehensive development and utilization that chemical industry is produced waste gas is also more and more important.In known technology, the industrialized producing technology of TDI (tolylene diisocyanate) mainly is divided into nitrated, the hydrogenation of toluene, operation such as photochemical, in the photochemical operation of TDI production process, can constantly isolate a large amount of byproduct hydrogen chloride gas, usually can cause pollution after the discharging, waste resource again environment.And at present at chemical field, preparing hydrochloric acid by hydrogen chloride gas is the processing method that adopts falling liquid film graphite to absorb mostly, and it mainly is to be used for chlorine industry.But because the byproduct hydrogen chloride gas flow rate fluctuation that is produced in the TDI production process is big, unstable, as the processing method that adopts falling liquid film graphite to absorb, easily cause the fluctuation of service of falling-film absorber, accident is emitted in easier generation spray, and then influence the normal operation of host system, and the assimilation effect of hydrogen chloride gas is poor, and prepared hydrochloric acid product concentration is low.
Summary of the invention
In order to overcome the deficiency of prior art, effectively solve the recycling problem of TDI byproduct hydrogen chloride gas, the invention provides a kind of new TDI byproduct hydrogen chloride gas that utilizes and prepare the processing method of hydrochloric acid, its processing method is simple and easy, stable, to the hydrogen chloride gas good absorbing effect, obtained hydrochloric acid product concentration height, quality are good, thereby avoid the hydrogen chloride gas discharging to cause environmental pollution, can make full use of resource, reduce the waste of resource.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of TDI of utilization byproduct hydrogen chloride gas prepares the processing method of hydrochloric acid, its design adopts two-stage absorption tower with process water absorbing hydrogen chloride gas, and constitutes circulation loop by absorption tower, recirculation cooler, salt acid circulating pump and carry out hydrochloric acid and circulate in a large number and absorb the processing method and the device thereof of enrichment, a small amount of extraction salt acid product.
The present invention utilizes the TDI byproduct hydrogen chloride gas to prepare the device of hydrochloric acid, it is that employing top is that bubble-plate column, bottom are that packing tower two portions are organized the two-stage absorption tower that is linked to be, on the bubble-plate column top on absorption tower and packing tower top respectively load process water inject pipeline, the bottom on absorption tower is fitted with the salt acid circulating pump, the salt acid circulating pump connects recirculation cooler, circulation loop is formed on the packing tower top that recirculation cooler is connected to the absorption tower, and bottom the absorption tower, being fitted with the finished product water cooler, the finished product water cooler connects the hydrochloric acid finished product storage tank.
The processing method that the present invention utilizes the TDI byproduct hydrogen chloride gas to prepare hydrochloric acid is:
A, will enter the absorption tower by the side mouth of tower bottom from the hydrogen chloride gas of TDI production system, simultaneously inject an amount of water respectively, carry out blended absorbent entering into the hydrogen chloride gas that rises in bubble-plate column and the packing tower on the bubble-plate column top and the packing tower top on absorption tower.
B, connect recirculation cooler to the packing tower top on absorption tower at absorption tower tower bottom load salt acid circulating pump and enter the absorption tower, make the hydrochloric acid of blended absorbent form circulation loop, carry out blended absorbent at the packing layer of packing tower and the hydrogen chloride gas of rising, the bubble-plate column that still unabsorbed hydrogen chloride gas rises to top, absorption tower carries out the secondary absorption.
C, inject the absorption tower service discharge by control and control liquid level at the bottom of the tower on absorption tower, hydrochloric acid on the absorption tower absorbs enrichment by constantly circulating, after concentration of hydrochloric acid reaches the setting index, beginning is by absorption tower bottom extraction hydrochloric acid, the hydrochloric acid of extraction enters the hydrochloric acid finished product storage tank after the cooling of finished product water cooler, be the salt acid product.
The inside, hydrogen chloride gas absorption tower of processing method of the present invention is positive pressure, thereby has prolonged hydrogen chloride gas at the intravital abundant soak time of tower, and most hydrogen chloride gas just is absorbed in packing tower, and surplus is all absorbed at bubble-plate column.
Adopt above-mentioned processing method because the present invention designs, effectively solved the recycling problem of TDI byproduct hydrogen chloride gas, and through the suitability for industrialized production trial run, the present invention has following characteristics: 1, processing method is simple, easy operation control is stable; 2, device structure is reasonable, invest little, instant effect; 3, adopt two-stage to absorb the absorption tower of handling, the TDI byproduct hydrogen chloride gas is absorbed cmpletely, can not cause exhaust emission, effectively protected environment, made full use of resource again; 4, adopt a large amount of circulations to absorb the processing method of enrichments, a small amount of extraction, institute's hydrochloric acid product concentration height, quality of making of reclaiming is good, can guarantee that the concentration of hydrochloric acid for preparing reaches commodity concentrated hydrochloric acid specification of quality.The present invention is applicable to the comprehensive development and utilization of byproduct hydrogen chloride gas in the various TDI manufacturing enterprise, and prepared hydrochloric acid is again broad-spectrum industrial chemicals.
Description of drawings
Below in conjunction with drawings and Examples the present invention is described in further detail.
Accompanying drawing 1 is a process flow diagram of the present invention.
Each label is in the accompanying drawing: 1, absorption tower (1-1, bubble-plate column, 1-2, packing tower), 2, by-pass valve control, 3 recirculation coolers, 4, recycle pump, 5, the finished product water cooler, 6, the process water injection tube, 7, the finished product storage tank.
Embodiment
The present invention adopts the two-stage absorption tower to absorb the TDI byproduct hydrogen chloride gas with process water, and connects and composes circulation loop by absorption tower, recirculation cooler, salt acid circulating pump and hydrochloric acid is circulated in a large number absorb the processing method and the device thereof of enrichment, a small amount of extraction salt acid product.
Embodiment as shown in Figure 1, the device that the present invention utilizes the TDI byproduct hydrogen chloride gas to prepare hydrochloric acid comprises: absorption tower 1, recirculation cooler 3, recycle pump 4, process water injection tube 6, finished product water cooler 5, finished product storage tank 7, absorption tower 1 is that top is bubble-plate column 1-1, the bottom is the two-stage absorption tower of packing tower 1-2, on the absorption tower 1 bubble-plate column top and the load of packing tower top process water injection tube 6, the bottom load salt acid circulating pump 4 on absorption tower 1, salt acid circulating pump 4 connects recirculation cooler 3, recirculation cooler 3 returns the packing tower top that is connected to the absorption tower and forms circulation loop, and on the absorption tower 1 bottom is fitted with finished product water cooler 5, finished product water cooler 5 connects hydrochloric acid finished product storage tanks 7.
The present invention utilizes the TDI byproduct hydrogen chloride gas to prepare the concrete industrialized producing technology embodiment of hydrochloric acid:
By-pass valve control 2 on a, the byproduct hydrogen chloride gas pipeline that will produce from the TDI production system be opened, hydrogen chloride gas enters absorption tower 1 by the side mouth of tower bottom, simultaneously 1 bubble-plate column top and packing tower top spray respectively and inject an amount of water on the absorption tower, carry out blended absorbent with entering into the hydrogen chloride gas water that packing tower rises to the bubble-plate column.
B, 1 bottom, absorption tower connection salt acid circulating pump 4, recirculation cooler 3 are back to the hydrochloric acid circulation loop at the packing tower top on absorption tower, the hydrochloric acid that makes blended absorbent in packing tower again with the hydrogen chloride gas that the rises absorption enrichment that circulates, at 68～78 ℃, the bubble-plate column that still unabsorbed hydrogen chloride gas rises to top, absorption tower all absorbs the heat exchange effect of control salt acid cooler with control absorption tower outlet at bottom hydrochloric acid temperature.
C, inject the absorption tower service discharge by control and control liquid level at the bottom of the tower on absorption tower, hydrochloric acid on the absorption tower absorbs enrichment by constantly circulating, after concentration of hydrochloric acid reaches setting index 31%, beginning is by absorption tower bottom extraction hydrochloric acid, and the hydrochloric acid of extraction enters hydrochloric acid finished product storage tank 7 after 5 coolings of finished product water cooler.
The inside, hydrogen chloride gas absorption tower of processing method of the present invention is positive pressure, thereby has prolonged hydrogen chloride gas at the intravital abundant soak time of tower, and most hydrogen chloride gas just is absorbed in packing tower, and surplus is all absorbed at bubble-plate column.
Claims (4)
1. device that utilizes the TDI byproduct hydrogen chloride gas to prepare hydrochloric acid, it is characterized in that, it comprises absorption tower (1), recirculation cooler (3), salt acid circulating pump (4), process water injection tube (6), finished product water cooler (5), finished product storage tank (7), absorption tower (1) is that top is bubble-plate column (1-1), the bottom is the two-stage absorption tower of packing tower (1-2), the bubble-plate column top of (1) and packing tower top are fitted with process water injection tube (6) on the absorption tower, the bottom on absorption tower (1) is fitted with salt acid circulating pump (4), salt acid circulating pump (4) connects recirculation cooler (3), recirculation cooler (3) returns the packing tower top that is connected to the absorption tower and forms circulation loop, and on the absorption tower bottom of (1) is fitted with finished product water cooler (5), finished product water cooler (5) connects hydrochloric acid finished product storage tank (7).
2. the TDI of utilization byproduct hydrogen chloride gas according to claim 1 prepares the device of hydrochloric acid, it is characterized in that, absorption tower (1) is to be made by the glass reinforced plastic of corrosion-resistant, anti-40～120 ℃ of temperature difference, and water cooler is a piece cellular type graphite heat exchanger.
3. the TDI of utilization byproduct hydrogen chloride gas according to claim 1 prepares the device of hydrochloric acid, it is characterized in that, absorption tower (1) inside is positive pressure.
4. processing method of utilizing the TDI byproduct hydrogen chloride gas to prepare hydrochloric acid, it is characterized in that, it is to adopt the two-stage absorption tower to absorb the TDI byproduct hydrogen chloride gas with process water, and connect and compose circulation loop by absorption tower, recirculation cooler, salt acid circulating pump and hydrochloric acid is circulated in a large number absorb the processing method of enrichment, a small amount of extraction salt acid product, be specially:
A, the byproduct hydrogen chloride gas that produces during TDI produced are entered in the absorption tower through the side mouth that by-pass valve control is transported to bottom, absorption tower (1) by pipeline, an amount of water is injected by process water injection tube (6) spray that is connected respectively with packing tower top in the bubble-plate column top of (1) on the absorption tower simultaneously, carry out blended absorbent with entering into the hydrogen chloride gas water that packing tower rises to the bubble-plate column
B, absorption tower (1) bottom connect salt acid circulating pump (4), recirculation cooler (3) returns the packing tower top that is connected to the absorption tower and forms circulation loop, the hydrochloric acid that makes blended absorbent in filler again with the hydrogen chloride gas that the rises absorption enrichment that circulates, the heat exchange effect of control salt acid cooler is as the criterion at 68～78 ℃ with the hydrochloric acid temperature of control absorption tower outlet at bottom, still the bubble-plate column that unabsorbed hydrogen chloride gas rises to top, absorption tower all absorbs
C, inject the absorption tower service discharge by control and control liquid level at the bottom of the tower on absorption tower, hydrochloric acid on the absorption tower absorbs enrichment by constantly circulating, after concentration of hydrochloric acid reaches the setting index, beginning is by absorption tower bottom extraction hydrochloric acid, and the hydrochloric acid of extraction enters hydrochloric acid finished product storage tank (7) after finished product water cooler (5) cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101530496A CN100460312C (en) | 2006-09-20 | 2006-09-20 | Method of preparing hydrochloric acid using TDI byproduct hydrogen chloride gas and its device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101530496A CN100460312C (en) | 2006-09-20 | 2006-09-20 | Method of preparing hydrochloric acid using TDI byproduct hydrogen chloride gas and its device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1948129A CN1948129A (en) | 2007-04-18 |
| CN100460312C true CN100460312C (en) | 2009-02-11 |
Family
ID=38017774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101530496A Active CN100460312C (en) | 2006-09-20 | 2006-09-20 | Method of preparing hydrochloric acid using TDI byproduct hydrogen chloride gas and its device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100460312C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101134565B (en) * | 2007-08-31 | 2010-10-20 | 上海海陆昆仑高科技工程有限公司 | New process for preparing chlorosulfonic acid and equipment thereof |
| CN103030242A (en) * | 2011-09-30 | 2013-04-10 | 宋洪义 | Dangerous substance adjustment separation transforming combination device |
| CN107161950B (en) * | 2017-06-29 | 2019-04-23 | 天津黄埔盐化工程技术有限公司 | A kind of thickening device and method of low concentration waste hydrochloric acid |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4786488A (en) * | 1982-03-05 | 1988-11-22 | Chemische Werke Huls Aktiengesellschaft | Process for the purification of hydrochloric acids |
| CN1077933A (en) * | 1992-04-23 | 1993-11-03 | 中国科学院上海硅酸盐研究所 | A kind of Technology for preparing industrial dilute hydrochloric acid |
| CN1096007A (en) * | 1993-05-31 | 1994-12-07 | 自贡市鸿鹤化工总厂 | Produce the method and the device of hydrochloric acid from the methane heat chlorination reactant |
| CN1258635A (en) * | 1998-12-31 | 2000-07-05 | 蒋荣科 | Concentrated hydrochloric acid preparing method and equipment by using hydrogen chloride as by product of chlorinated paraffin production |
-
2006
- 2006-09-20 CN CNB2006101530496A patent/CN100460312C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4786488A (en) * | 1982-03-05 | 1988-11-22 | Chemische Werke Huls Aktiengesellschaft | Process for the purification of hydrochloric acids |
| CN1077933A (en) * | 1992-04-23 | 1993-11-03 | 中国科学院上海硅酸盐研究所 | A kind of Technology for preparing industrial dilute hydrochloric acid |
| CN1096007A (en) * | 1993-05-31 | 1994-12-07 | 自贡市鸿鹤化工总厂 | Produce the method and the device of hydrochloric acid from the methane heat chlorination reactant |
| CN1258635A (en) * | 1998-12-31 | 2000-07-05 | 蒋荣科 | Concentrated hydrochloric acid preparing method and equipment by using hydrogen chloride as by product of chlorinated paraffin production |
Non-Patent Citations (4)
| Title |
|---|
| 两段法吸收氯化氢尾气的工业应用研究. 鲁忠生，刘永明，张春华，李志波，张力明.氯碱工业，第4期. 2006 |
| 两段法吸收氯化氢尾气的工业应用研究. 鲁忠生，刘永明，张春华，李志波，张力明.氯碱工业，第4期. 2006 * |
| 浅谈氯化氢吸收与盐酸脱吸技术. 仇晓丰，吴春森，伍明霞.氯碱工业，第1期. 2004 |
| 浅谈氯化氢吸收与盐酸脱吸技术. 仇晓丰，吴春森，伍明霞.氯碱工业，第1期. 2004 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1948129A (en) | 2007-04-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203264546U (en) | Cyclic absorption device for hydrogen chloride tail gas | |
| CN201704080U (en) | Alkaline etching liquid ammonia evaporation and ammonia absorption system | |
| CN208583157U (en) | A kind of small ammonia water process units | |
| CN100460312C (en) | Method of preparing hydrochloric acid using TDI byproduct hydrogen chloride gas and its device | |
| CN104208987A (en) | Tail gas recovery device for urea ammonium nitrate solution production | |
| CN205241252U (en) | Synthetic ammonia optimization improves system | |
| CN102556974B (en) | Method for continuously preparing iodine pentafluoride | |
| CN201694849U (en) | Hydrogen sulfide removing device of carbon disulfide recovery system | |
| CN105600995B (en) | A kind of high ammonia-nitrogen wastewater recycling and zero discharge processing method and processing device of film aeration and film absorbing coupling technique | |
| CN106219644B (en) | A kind of method that ammonia, water recycle and prepares ammonium hydroxide in polyetheramine production process | |
| CN203187610U (en) | Methenamine production device | |
| CN201990481U (en) | Concentration device for dilute hydrochloric acid | |
| CN206229189U (en) | A kind of absorption tower | |
| CN109232171A (en) | A kind of method of the complete thick vinyl chloride gas middle acid substance of removing | |
| CN202327642U (en) | Series circulating utilization system for heating water of liquid-chlorine gasification pool and condensation circulating water of ice maker | |
| CN201713348U (en) | Distillation device for ammonia recovery | |
| CN107008133A (en) | Phenmethylol produces waste gas and integrated wastewater treatment plant | |
| CN112452114A (en) | Process and device for treating HCl-containing gas and by-producing high-concentration hydrochloric acid | |
| CN201240839Y (en) | Recovery device for mixed waste gas of hydrogen chloride and sulfuric dioxide in lipoic acid production | |
| CN101774549A (en) | Chlorosulfonic acid production process and equipment thereof | |
| CN204247032U (en) | Device for recovering tail gas in a kind of urea ammonium nitrate solution production | |
| CN103524298B (en) | Method for recovering methanol from tail gas washing water in low-temperature methanol washing technology | |
| CN201258305Y (en) | Equipment system for continuously preparing sulphur chlorination isobutene | |
| CN2897991Y (en) | System for producing high-concentration carbon-13-carbon dioxide | |
| CN220824659U (en) | High-temperature hydrogen chloride absorption device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CANGZHOU DAHUA GROUP CO., LTD. Free format text: FORMER OWNER: DAHUA GROUP CO., LTD., CANGZHOU CITY, HEBEI PROV. Effective date: 20130320 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130320 Address after: 061001 No. 19 East Yongji Road, Hebei, Cangzhou Patentee after: Cangzhou Dahua Refco Group Ltd Address before: Cangzhou City, Hebei Province, 061001 North Road No. 66, Cangzhou Dahua Group Company Patentee before: Dahua Group Co., Ltd., Cangzhou City, Hebei Prov. |