CN100369822C - Method for treating mother liquor discharged from amino acetic acid production - Google Patents
Method for treating mother liquor discharged from amino acetic acid production Download PDFInfo
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- CN100369822C CN100369822C CNB2006100126486A CN200610012648A CN100369822C CN 100369822 C CN100369822 C CN 100369822C CN B2006100126486 A CNB2006100126486 A CN B2006100126486A CN 200610012648 A CN200610012648 A CN 200610012648A CN 100369822 C CN100369822 C CN 100369822C
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- mother liquor
- acetic acid
- amino acetic
- enters
- ammonium chloride
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Abstract
The present invention relates to a treatment method of mother liquor in the production of chemical industry, particularly to a treatment method of the mother liquor discharged from amino acetic acid. After the mother liquor enters a feeding flow meter via a mother liquor delivery pump for metering, the measured mother liquor enters a feed preheater, and then the mother liquor preheated to the temperature of 50 to 55 DEG C enters a rectifying tower; finally, methanol and ammonium chloride as a by-product are obtained under the action of a condenser and a gas-liquid separator. The present invention is characterized in that a proper amount of hydrochloric acid is added to the mother liquor before the mother liquor enters the feeding flow meter, so the pH value of the mother liquor is regulated to about 6, and free ammonia in the mother liquor is neutralized thoroughly to enable the mother liquor in neutral. The method has the advantages that the quality of the methanol is improved, pipelines are prevented from being clogged, and the yield of the amino acetic acid as a product is greatly raised at the same time.
Description
Technical field
The present invention relates to the treatment process of mother liquor in the Chemical Manufacture, be specially the treatment process of mother liquor discharged from amino acetic acid.
Background technology
General production discharged from amino acetic acid does not add processing to the mother liquor in the mother liquor pond and directly enters the feed rate meter after metering through the mother liquor transferpump, enter feed preheater, enter rectifying tower when being preheating to certain temperature (50 ℃～55 ℃), pass through condenser again, the effect of gas-liquid separator obtains methyl alcohol and by-product ammonium chloride.Contain methyl alcohol in its mother liquor, water, ammonium chloride, free ammonia and other impurity, ammonia is carried ammonium chloride secretly and is risen up into the rectifying tower cat head, through the easy blocking pipe of condensation post chlorization ammonium crystal, influences working efficiency; It is many to contain ammonium chloride in the methyl alcohol, influences methanol quality.
Summary of the invention
Purpose of the present invention just is to provide a kind of treatment process of producing the mother liquor of discharged from amino acetic acid, thereby improves methanol quality, prevents line clogging, and the Padil yield with its methanol extraction gained is improved simultaneously.
Technical scheme of the present invention is: add appropriate hydrochloric acid in producing the mother liquor of discharged from amino acetic acid in the mother liquor pond, regulate about pH value to 6, fully and the free ammonia in the mother liquor, mother liquor is near the neutral slightly acidic, and mother liquor enters the feed rate meter and enter feed preheater after metering through the mother liquor transferpump then, be preheating to certain temperature and enter rectifying tower, pass through condenser again, the effect of gas-liquid separator obtains methyl alcohol and by-product ammonium chloride.
The present invention adopts that the beneficial effect of its generation is after the technique scheme: when not adding hydrochloric acid, contain ammonium chloride impurity 1.5%-2.0% in the methyl alcohol that rectifying obtains, the Padil product chlorination object height with its extraction obtains is difficult for reaching the product requirement standard.And the rectifying device pipeline is blocked easily, often mediation, and the progress that dallies over one's work has been brought loss to the postorder work of full factory, and has been wasted the man power and material, and had potential safety hazard.After adding hydrochloric acid in the mother liquor, containing ammonium chloride impurity in the methyl alcohol drops to below 0.2%, about 0.30%, meet the product requirement standard with its Padil muriate that extracts gained, and the Padil yield improves 4%-5%, Padil is to produce 40000 tons per year, can increase production 1800 tons,, and solved the blockage problem of rectifying tower equipment, for enterprise's postorder work offers convenience, for enterprise brings immeasurable income.
Embodiment
Example one:
Add appropriate hydrochloric acid in the mother liquor, regulating pH value is 6, and it is neutral making mother liquor.Mother liquor is squeezed into the feed rate meter through transferpump, carries out a small amount of charging by feed preheater, and the preheater temperature is 50 ℃～55 ℃, and open water on the condenser, when tower top temperature reaches 66 ℃～70 ℃, and stablize about 10 minutes constant, its concentration of sampling and testing was at 91～94% o'clock, methyl alcohol begins to distillate on a small quantity, methyl alcohol is reclaimed in condensation then again, when the still temperature reaches 105 ℃～109 ℃, begin to arrange raffinate, reclaim ammonium chloride.Containing the ammonium chloride impurity level in its methyl alcohol is 0.16%, and 1.8% foreign matter content is much lower when not adding acid, and has solved the line clogging problem.
Claims (1)
1. produce the treatment process of mother liquor discharged from amino acetic acid, mother liquor is through the mother liquor transferpump, enter the feed rate meter and after metering, enter feed preheater, be preheating to temperature and in the time of 50 ℃～55 ℃, enter rectifying tower, pass through condenser again, the effect of gas-liquid separator, obtain methyl alcohol and by-product ammonium chloride, its feature adds appropriate hydrochloric acid at mother liquor in mother liquor before entering the feed rate meter, regulates about pH value to 6, fully and the free ammonia in the mother liquor, mother liquor is near the neutral slightly acidic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100126486A CN100369822C (en) | 2006-04-28 | 2006-04-28 | Method for treating mother liquor discharged from amino acetic acid production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100126486A CN100369822C (en) | 2006-04-28 | 2006-04-28 | Method for treating mother liquor discharged from amino acetic acid production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1837074A CN1837074A (en) | 2006-09-27 |
| CN100369822C true CN100369822C (en) | 2008-02-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100126486A Active CN100369822C (en) | 2006-04-28 | 2006-04-28 | Method for treating mother liquor discharged from amino acetic acid production |
Country Status (1)
| Country | Link |
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| CN (1) | CN100369822C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104193751A (en) * | 2014-07-25 | 2014-12-10 | 沈美忠 | Method for treating mother liquid discharged in glycine production |
| CN107311878B (en) * | 2017-06-09 | 2023-08-08 | 石家庄新奥环保科技有限公司 | Device for recycling glycine waste liquid and method for recycling glycine waste liquid |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0692917A (en) * | 1992-07-16 | 1994-04-05 | Hakko Tsusho Kk | Improved method of synthesizing glycine |
| CN1134931A (en) * | 1995-05-04 | 1996-11-06 | 郑学明 | Distillation equipment for crystallized mother liquor in the prodn. of amino acetic acid |
| CN1136035A (en) * | 1995-05-19 | 1996-11-20 | 河北东华化工总公司 | Preparation of amino-acetic acid |
| CN1340498A (en) * | 2000-08-31 | 2002-03-20 | 浙江新安化工集团股份有限公司 | Process for preparing glycine |
-
2006
- 2006-04-28 CN CNB2006100126486A patent/CN100369822C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0692917A (en) * | 1992-07-16 | 1994-04-05 | Hakko Tsusho Kk | Improved method of synthesizing glycine |
| CN1134931A (en) * | 1995-05-04 | 1996-11-06 | 郑学明 | Distillation equipment for crystallized mother liquor in the prodn. of amino acetic acid |
| CN1136035A (en) * | 1995-05-19 | 1996-11-20 | 河北东华化工总公司 | Preparation of amino-acetic acid |
| CN1340498A (en) * | 2000-08-31 | 2002-03-20 | 浙江新安化工集团股份有限公司 | Process for preparing glycine |
Non-Patent Citations (3)
| Title |
|---|
| 1000吨/年甘氨酸生产母液中甲醇回收新技术. 马峰等.河北大学学报(自然科学版)，第1期. 1997 * |
| 甘氨酸母液甲醇回收精馏塔的设计. 刘俊敏等.河北化工，第2期. 1999 * |
| 甘氨酸生产中甲醇的回收. 林保东.湖北化工，第4期. 1996 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1837074A (en) | 2006-09-27 |
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