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Method for treating acid-extracted waste liquid used for production of saccharin sodium

A treatment method and technology of sodium saccharin, applied in separation methods, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of wasting resources, increasing production costs, environmental pollution, etc., reducing consumption and increasing capital investment. , the effect of reducing production costs

Active Publication Date: 2008-12-03
天津北方食品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the waste water is directly discharged after being neutralized by liquid caustic soda, and the compounds and organic substances that can be used in it are not recovered, which will not only waste resources and increase production costs, but also cause environmental pollution after the waste liquid is discharged. Cause certain pollution, which is not conducive to environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1) Pass the waste liquid after acid analysis of 1800L ammoniated liquid into the ammonia exhaust absorption tower to circulate and absorb ammonia gas until the pH value of the waste liquid reaches 6;

[0015] 2) Distill the above-mentioned waste liquid obtained after circulating and absorbing ammonia in the ammonia absorption tower while stirring, collect 1000L of evaporated liquid containing methanol and add it to the esterification reactor as hot water used in the esterification process, and simultaneously Increase the methanol content in the evaporating liquid, then distill the methanol-containing mother liquor released from the esterification reactor with a distillation tower, and collect fractions at 64-80°C to obtain 100L of methanol with a concentration of 80%;

[0016] 3) Continue to evaporate the mother liquor after distilling methanol from the above-mentioned acid analysis waste liquid until the remaining volume reaches 800 L, and add 5 kg of activated carbon a...

Embodiment 2

[0021] 1) Pass the waste liquid after acid analysis of 1800L ammoniated liquid into the ammonia exhaust absorption tower to circulate and absorb ammonia gas until the pH value of the waste liquid reaches 6;

[0022] 2) Distill the above-mentioned waste liquid obtained after circulating and absorbing ammonia in the ammonia absorption tower while stirring, collect 1100L of evaporated liquid containing methanol and add it to the esterification reactor as hot water used in the esterification process, and simultaneously Increase the methanol content in the evaporating liquid, then distill the methanol-containing mother liquor discharged from the esterification reactor with a distillation tower, and collect fractions at 64 to 80°C to obtain 105 L of 80% methanol;

[0023] 3) Continue to evaporate the mother liquor after distilling methanol from the above-mentioned acid analysis waste liquid until the remaining volume reaches 800 L, and add 5 kg of activated carbon and 0.5 kg of sodiu...

Embodiment 3

[0028] 1) Pass the waste liquid after acid analysis of 1800L ammoniated liquid into the ammonia exhaust absorption tower to circulate and absorb ammonia gas until the pH value of the waste liquid reaches 6;

[0029] 2) Distill the above-mentioned waste liquid obtained after circulating and absorbing ammonia in the ammonia absorption tower while stirring, collect 1050L of evaporated liquid containing methanol and add it to the esterification reactor as hot water used in the esterification process, and simultaneously Increase the methanol content in the evaporating liquid, then distill the methanol-containing mother liquor discharged from the esterification reactor with a distillation tower, and collect fractions at 64-80°C to obtain 102.5 L of methanol at a concentration of 80%;

[0030] 3) Continue to evaporate the mother liquor after distilling methanol from the above-mentioned acid analysis waste liquid until the remaining volume reaches 800 L, and add 5 kg of activated carbo...

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PUM

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Abstract

The invention discloses a disposing method of soluble saccharin acid out waste liquid, which is characterized by the following: utilizing alcaine part to replace sulfuric acid to adsorb ammonia gas in the carbamyl procedure; reducing sulfuric acid consumption; adopting distilling method to separate carbinol and mother liquid with amchlor; making evaporating liquid with carbinol as hot water of esterification procedure to improve carbinol content; recycling carbinol through distilling method for soluble saccharin manufacturing course; utilizing amchlor as fertilizer and chemical synthetic raw material; reducing pollution.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, in particular to a treatment method for sodium saccharin acid precipitation waste liquid. Background technique [0002] Sodium saccharin, which is usually used as a food sweetener, is the sodium salt of saccharin, which is easily soluble in water. Ammonification, acid precipitation, alkalization and decolorization reaction to produce sodium saccharin aqueous solution, and then filter the solution, concentrate to a certain concentration, cool down to crystallize, and dry to produce. Wherein the waste liquid produced after the ammoniated liquid acid is separated out insoluble saccharin contains a small amount of hydrochloric acid, 8-12% of ammonium chloride and 5% of methanol. At present, the waste water is directly discharged after being neutralized by liquid caustic soda, and the compounds and organic substances that can be used in it are not recovered, which will not only waste resources and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/66C02F1/04C02F1/28C02F1/64B01D53/58C07C31/04C01C1/16
Inventor 杨俊华李胜彬刘立杰马近贤冷文广李晓君刘永胜
Owner 天津北方食品有限公司
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