CN100404421C - Process for combined production of melamine, sodium carbonate, and ammonium chloride - Google Patents
Process for combined production of melamine, sodium carbonate, and ammonium chloride Download PDFInfo
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- CN100404421C CN100404421C CNB2006100451656A CN200610045165A CN100404421C CN 100404421 C CN100404421 C CN 100404421C CN B2006100451656 A CNB2006100451656 A CN B2006100451656A CN 200610045165 A CN200610045165 A CN 200610045165A CN 100404421 C CN100404421 C CN 100404421C
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- mother liquor
- ammonium chloride
- melamine
- crystallizer
- soda ash
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2
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Abstract
The present invention relates to a technology for preparing melamine and simultaneously preparing sodium carbonate and ammonium chloride, which belongs to the technical field of preparing melamine from urea. The present invention is characterized in that tail gas for synthesizing melamine is absorbed by mother liquid II in a sodium carbonate procedure; after being mixed, absorbing liquid is filled in a carbonization tower for absorbing and synthesizing carbon dioxide discharged from a decarbonizing working section; then the absorbing liquid is filled in an alkali filtering machine for separating sodium bicarbonate; the separated sodium bicarbonate is calcined to form sodium carbonate; mother liquid I filtered by the alkali filtering machine is filled in a cold-separation crystallizer to be cooled and crystallized for separating ammonium chloride; the mother liquid is overflowed in a salt-separation crystallizer to be treated with salt separation for further separating the ammonium chloride; ammonium chloride suspension liquid collected from the lower part of the salt-separation crystallizer is filled in a concentrating device, and is centrifugated by a centrifuge to obtain an ammonium chloride finished product; filtered liquid is sent back to the salt-separation crystallizer, the supernatant liquid in the salt-separation crystallizer is the mother liquid II; the mother liquid II is filled in a washing tower for absorbing melamine tail gas to form circulation. The technology of the present invention has the advantages of little investment, environmental protection and obvious economic benefit.
Description
Technical field
The invention belongs to from urea production trimeric cyanamide technical field, be specifically related to a kind of technology combined production of melamine soda ash and ammonia chloride craft.
Background technology
Trimeric cyanamide, having another name called melamine (melamine) is a kind of important organic chemistry intermediates, its major industry purposes is to make terpolycyantoamino-formaldehyde resin with formaldehyde condensation polymer.The Production of Cyanuramide method has Dyhard RU 100 method and Wyler's process according to the raw material branch.Dyhard RU 100 method raw material is begun by calcium carbide, needs to consume a large amount of electric energy, the raw material sources difficulty, and this method now is eliminated.
It is raw material that present domestic Melamine Production all adopts urea, the most of dried method for refining of catching of normal pressure that adopts of its technical process.This technology generally is divided into preparation, refining and three workshop sections of vent gas treatment.Preparation workshop section is: raw material urea is blown into reactor by gas ammonia, and catalyzer is a silica gel, and under 385-395 ℃, urea generates trimeric cyanamide in reactor internal condensation reaction, through the trap cooling capture the crude product trimeric cyanamide; Refining workshop section: the crude product trimeric cyanamide is with mother liquor (generally also needing to add acetic acid and gac) dissolving, crystallization, through centrifugation, drying, pulverize refining trimeric cyanamide; Vent gas treatment is the emphasis of studying at present, and prior art generally is with tail gas and other products coproduction, and modal technology is coproduction carbon ammonium.
By retrieval, do not find the pertinent literature of combined production of melamine soda ash and ammonium chloride.
Summary of the invention
The invention provides a kind of combined production of melamine soda ash and ammonia chloride craft, this technology investment is few, environmental protection, remarkable in economical benefits.
The concrete technical scheme that the present invention adopts is as follows:
Combined production of melamine soda ash and ammonia chloride craft, it is characterized in that of the mother liquor II absorption of the tail gas of production of melamine by the soda ash operation, after being configured, absorption liquid enters the carbonic acid gas that carbonating tower absorbs the discharging of synthetic decarburization workshop section, entering Alkali-filter separates sodium bicarbonate, isolated sodium bicarbonate becomes yellow soda ash through calcining; The mother liquor I that Alkali-filter leaches sends into cool crystallizer, decrease temperature crystalline is separated out ammonium chloride, and salting-out crystallizer is gone in the mother liquor overflow, further separates out ammonium chloride through saltouing, the ammonium chloride suspension that takes out from the salting-out crystallizer bottom enters the centrifugal ammonium chloride finished product that gets of whizzer through the stiff device; Filtrate is sent salting-out crystallizer back to, and the salting-out crystallizer supernatant liquor is mother liquor II, and mother liquor II enters and washes tower absorption melamine tail gas, forms circulation.
Mother liquor I enters and enters interchanger before the cool crystallizer and carry out heat exchange with mother liquor II from salting-out crystallizer; The trimeric cyanamide per ton 5.1 tons of soda ash that form a complete production network.
Mother liquor II is configured back α value: FNH
3/ CO
2=2.15～2.35, ammonia mother liquor II β value is: FNH
3/ Na
+=1.04～1.08.
Contain ammonia and carbonic acid gas in the tail gas of trimeric cyanamide by-product simultaneously, analyze theoretically, ammonia and carbonic acid gas can be as the unstripped gass of preparation soda ash, key of the present invention is: absorb most carbonic acid gas and keep most of ammonia with mother liquor II, get back in the reaction gas of triamine after making waste gas by processing such as cooling, dryings.
The reason that the present invention does not adopt mother liquor I to absorb is: if adopt mother liquor I to absorb triamine tail gas then can cause that the content of carbonic acid gas increases in the mother liquor, make that having the heavy alkali of part and carbon ammonium and ammonium chloride during in cold analysis at ammonium chloride separates out jointly, makes ammonium chloride be difficult to ordinary production.
The present invention adopts mother liquor II to absorb the material balance of technology of the present invention that tail gas is based on.The condition that prevents to produce eutectoid is that the α value satisfies: FNH
3/ CO
2=2.15～2.35, ammonia mother liquor II β value satisfies: FNH
3/ Na
+=1.04～1.08.Through applicant's test of many times, the conclusion that draws is: when combined production of melamine soda ash, the tail gas of trimeric cyanamide absorbed as only using mother liquor II, processing condition satisfied the production requirement of connection alkali, and the product ratio is 1: 5.1, and the material balance table is as follows:
Table 1 material balance table (calculating) with the ton trimeric cyanamide
Beneficial effect of the present invention is:
1) the mother liquor II of technology soda ash operation of the present invention absorbs the tail gas of trimeric cyanamide by-product, further absorbs the carbon dioxide production soda ash of synthesizing section discharging simultaneously, can increase output, technology environmental protection, economy;
2) after the trimeric cyanamide reaction end gas absorbed and finishes, ammonia concentration can reach 90%, the tail gas recycle, and utilization ratio can reach 100%;
3) the present invention can all adopt carbon steel equipment, less investment;
4) Information integration utilization ratio height of the present invention, the yield height of trimeric cyanamide, cost is low, and comprehensive cost is than low 3000 yuan/ton of existing technology.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
Embodiment
Embodiment 1
The trimeric cyanamide operation:
Raw material urea is blown into reactor by gas ammonia, after being preheated to 350-400 ℃, catalyzer is blown afloat fluidization with the gas ammonia of sending here from circulator from reactor bottom, under 385-395 ℃, urea generates trimeric cyanamide at the reactor internal reaction, reactant comes out from reactor head, enter strainer and remove and enter trap behind the catalyst dust and lower the temperature naturally and sublimate, sedimentation captures the trimeric cyanamide that gets off and goes to make with extra care; The circulation gas that trap comes out purifies absorbing carbon dioxide through the absorption tower, and absorption liquid is the mother liquor II of soda ash operation, and the α value of mother liquor II is: FNH
3/ CO
2=2.15, the β value is: FNH
3/ Na
+=1.04, the mother liquor after the absorption enters the carbonating tower of soda ash operation; The circulation gas that purifies returns circulator after refrigerated separation, enter reactor after the compression.
The soda ash operation:
Mother liquor II by the trimeric cyanamide operation is after the clarification of settling tank precipitation, squeeze into the carbonic acid gas that carbonating tower and decarburization workshop section send here and carry out counter current contact, generating sodium bicarbonate is filtered through Alkali-filter by the taking-up of carbonating tower bottom, mother liquor I goes the ammonium chloride operation, solid sodium bicarbonate goes calcining furnace calcining finished product yellow soda ash, waste gas carbonic acid gas, ammonia to go to remove washing tower after the condensing tower cooling, and recovery tower reclaims ammoniacal liquor, removes storage tank, remove settling tank again, reach recycle.
The ammonium chloride operation:
The mother liquor I that system alkali operation is come, go ammonia absorber to receive the ammonia mother liquor I that ammonia reaches the ammonium chloride crystals requirement, go interchanger and mother liquor II heat exchange, the sodium-chlor of device and adding of decrystallizing then enters crystallizer simultaneously and reacts, generate ammonium chloride crystals, and be taken to the stiff device and be separated into the ammonium chloride finished product through whizzer, mother liquor is squeezed into crystallizer again, regeneration ammonium chloride, the clear liquid on crystallizer top, mother liquor II go to go the trimeric cyanamide operation to wash the mother liquor II that tower washing triamine tail gas reaches the requirement of system alkali operation after the interchanger heat exchange.
Embodiment 2
Enter carbonating tower after mother liquor II is configured and absorb, its α value is: FNH
3/ CO
2=2.25, the β value is: FNH
3/ Na
+=1.06, all the other are with embodiment 1.
Embodiment 3
Enter carbonating tower after mother liquor II is configured and absorb, its α value is: FNH
3/ CO
2=2.35, the β value is: FNH
3/ Na
+=1.08, all the other are with embodiment 1.
Claims (3)
1. combined production of melamine soda ash and ammonia chloride craft, it is characterized in that of the mother liquor II absorption of the tail gas of production of melamine by the soda ash operation, after being configured, absorption liquid enters the carbonic acid gas that carbonating tower absorbs the discharging of synthetic decarburization workshop section, entering Alkali-filter separates sodium bicarbonate, isolated sodium bicarbonate becomes yellow soda ash through calcining; The mother liquor I that Alkali-filter leaches sends into cool crystallizer, decrease temperature crystalline is separated out ammonium chloride, and salting-out crystallizer is gone in the mother liquor overflow, further separates out ammonium chloride through saltouing, the ammonium chloride suspension that takes out from the salting-out crystallizer bottom enters the stiff device, through the centrifugal ammonium chloride finished product that gets of whizzer; Filtrate is sent salting-out crystallizer back to, and the salting-out crystallizer supernatant liquor is mother liquor II, and mother liquor II enters and washes tower absorption melamine tail gas, forms circulation;
Described mother liquor II is configured back α value: FNH
3/ CO
2=2.15～2.35, ammonia mother liquor II β value is: FNH
3/ Na
+=1.04～1.08.
2. combined production of melamine soda ash according to claim 1 and ammonia chloride craft is characterized in that mother liquor I enters to enter interchanger before the cool crystallizer and carry out heat exchange with mother liquor II from salting-out crystallizer.
3. combined production of melamine soda ash according to claim 1 and ammonia chloride craft is characterized in that the trimeric cyanamide per ton 5.1 tons of soda ash that form a complete production network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100451656A CN100404421C (en) | 2006-06-27 | 2006-06-27 | Process for combined production of melamine, sodium carbonate, and ammonium chloride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100451656A CN100404421C (en) | 2006-06-27 | 2006-06-27 | Process for combined production of melamine, sodium carbonate, and ammonium chloride |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1884080A CN1884080A (en) | 2006-12-27 |
| CN100404421C true CN100404421C (en) | 2008-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100451656A Expired - Fee Related CN100404421C (en) | 2006-06-27 | 2006-06-27 | Process for combined production of melamine, sodium carbonate, and ammonium chloride |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101519383B (en) * | 2009-03-25 | 2010-08-25 | 北京烨晶科技有限公司 | Process for jointly producing cyanuramide, sodium carbonate and ammonium chloride by using carbamide |
| CN102284189B (en) * | 2010-06-18 | 2013-10-16 | 中昊(大连)化工研究设计院有限公司 | Novel slurry circular-type crystallizer and application thereof |
| CN102502716B (en) * | 2011-11-10 | 2013-08-07 | 赵祥海 | Technology for cooling ammonia mother liquor I in crystallizing working section during combined soda producing process |
| CN103755393B (en) * | 2014-01-22 | 2015-06-10 | 山东恒昌聚材化工科技股份有限公司 | Device and method for co-producing potassium sulphate compound fertilizer from tripolycyanamide tail gas |
| CN106276982A (en) * | 2016-10-19 | 2017-01-04 | 中盐昆山有限公司 | Soda and sociation center novel environment friendly circulation technology system and method |
| CN115925655A (en) * | 2022-11-29 | 2023-04-07 | 江苏兄弟维生素有限公司 | Process method for synthesizing and co-producing sodium bicarbonate solution by alpha-chloro-alpha-acetyl-gamma-butyrolactone and application thereof |
| CN116282082A (en) * | 2023-03-03 | 2023-06-23 | 淮北师范大学 | CO recycling from coke oven flue gas 2 Process for producing sodium carbonate and ammonium chloride |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1493565A (en) * | 2003-09-17 | 2004-05-05 | 丁泽华 | Trimeric cyanamide joint production method using one step method |
| CN1613769A (en) * | 2004-11-12 | 2005-05-11 | 王禄宏 | Combined production of alkali by using waste water |
-
2006
- 2006-06-27 CN CNB2006100451656A patent/CN100404421C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1493565A (en) * | 2003-09-17 | 2004-05-05 | 丁泽华 | Trimeric cyanamide joint production method using one step method |
| CN1613769A (en) * | 2004-11-12 | 2005-05-11 | 王禄宏 | Combined production of alkali by using waste water |
Also Published As
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|---|---|
| CN1884080A (en) | 2006-12-27 |
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Address after: 256120 No. 36 Dongfeng Road, Yiyuan County, Shandong, Zibo Patentee after: SHANDONG LIAHERD CHEMICAL INDUSTRY CO., LTD. Address before: 256120 No. 36 Dongfeng Road, Yiyuan County, Shandong, Zibo Patentee before: Shandong United Chemical Industry Co., Ltd. |
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Effective date of registration: 20171017 Address after: Yiyuan County Economic Development Zone 256100 Shandong city of Zibo province (county Yihe Road No. 1329) Patentee after: Shandong Heli Chemical Co., Ltd. Address before: 256120 No. 36 Dongfeng Road, Yiyuan County, Shandong, Zibo Patentee before: SHANDONG LIAHERD CHEMICAL INDUSTRY CO., LTD. |
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Granted publication date: 20080723 Termination date: 20190627 |