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Recycling method of hydrochloric acid-acetic acid waste liquid

A technology of hydrochloric acid solution and acetic acid, applied in the field of medicine and chemical industry, can solve the problem of low concentration of hydrochloric acid solution and acetic acid solution, and achieve the effect of reducing labor intensity of workers, improving production safety and high concentration

Active Publication Date: 2012-04-18
YUHUAN MARINE BIOCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the defective that exists in above prior art, provides a kind of recycling method of hydrochloric acid-acetic acid waste liquid, and its purpose is to solve the problem of a large amount of hydrochloric acid-acetic acid waste liquid that produces when producing D-glucosamine hydrochloride, reduce Reduce waste of resources and environmental pollution; solve the problem of low concentration of hydrochloric acid solution and acetic acid solution obtained when the hydrochloric acid-acetic acid waste liquid is recovered in the prior art

Method used

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Examples

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Embodiment 1

[0027] 1m of hydrochloric acid-acetic acid waste liquid produced in the process of producing D-glucosamine hydrochloride 3Joined in the reaction kettle, then added 200kg calcium chloride, stirred to make calcium chloride completely dissolved in the hydrochloric acid-acetic acid waste liquid, prepared into a distillation material, then, the above-mentioned prepared distillation material was pumped into the falling film tower. Inside, open the vacuum system, adjust the vacuum degree in the falling film tower to about 600mmHg column, after the system in the falling film tower is stable, gradually increase the vacuum degree and temperature in the falling film tower, so that the vacuum degree reaches 720mmHg column, the temperature When the temperature reaches 35°C, the vacuum degree and temperature are controlled, and rectification is carried out for 12 hours. During the rectification process, the evaporated gas is cooled by a condenser, and the cooled liquid is returned to the fal...

Embodiment 2

[0030] 1m of hydrochloric acid-acetic acid waste liquid produced in the process of producing D-glucosamine hydrochloride 3 Joined in the reaction kettle, then added 400kg calcium chloride, stirred to make calcium chloride completely dissolved in the hydrochloric acid-acetic acid waste liquid, prepared into a distillation material, then, the above-mentioned prepared distillation material was pumped into the falling film tower. Inside, open the vacuum system, adjust the vacuum degree in the falling film tower to about 600mmHg column, after the system in the falling film tower is stable, gradually increase the vacuum degree and temperature in the falling film tower, so that the vacuum degree reaches 700mmHg column, the temperature When the temperature reaches 40°C, the vacuum degree and temperature are controlled, and rectification is carried out for 10 hours. During the rectification process, the evaporated gas is cooled by the condenser, and the cooled liquid is returned to the ...

Embodiment 3

[0033] 1m of hydrochloric acid-acetic acid waste liquid produced in the process of producing D-glucosamine hydrochloride 3 Joined in the reaction kettle, then added 600kg calcium chloride, stirred to make the calcium chloride completely dissolved in the hydrochloric acid-acetic acid waste liquid, prepared into a distillation material, then, the above-mentioned prepared distillation material was pumped into the falling film tower. Inside, open the vacuum system, adjust the vacuum degree in the falling film tower to about 630mmHg column, after the system in the falling film tower is stable, gradually increase the vacuum degree and temperature in the falling film tower, so that the vacuum degree reaches 720mmHg column, the temperature When the temperature reaches 46°C, the vacuum degree and temperature are controlled, and rectification is carried out for 18 hours. During the rectification process, the evaporated gas is cooled by the condenser, and the cooled liquid is returned to ...

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Abstract

The invention relates to a recycling method of hydrochloric acid-acetic acid waste liquid, and belongs to the chemical technical field. The method of the invention comprises the following steps: adding calcium chloride into hydrochloric acid-acetic acid waste liquid to prepare a material for distillation, adding the material into a falling film column, performing reduced-pressure rectification, orderly performing dehydration and deacidification treatmend of the volatilized non-condensable gas, absorbing the non-condensable gas by water to obtain a hydrochloric acid solution; transferring the liquid in the falling film column after rectification into another container, adding an extractant and a diluent, performing extraction, allowing the liquid to stand for stratification, collecting theorganic phase, performing rectification of the obtained organic phase so as to obtain an acetic acid solution. The method of the invention has the following advantages: multiple units are combined for the waste liquid treatment, which reduces the production cost, decreases the labor intensity, and facilitates energy saving and emission reduction, and cleaner production; the recovered hydrochloricacid solution and acetic acid solution have good quality; no introduction of hydrogen chloride gas is needed to increase the concentration of the hydrochloric acid solution, which both increases the production security and ensures the quality of the recovered products.

Description

technical field [0001] The invention relates to a method for recycling waste liquid, in particular to a method for recycling hydrochloric acid-acetic acid waste liquid, and belongs to the technical field of medicine and chemical industry. Background technique [0002] D-Glucosamine hydrochloride is a non-toxic, biodegradable, sugary substance with good bioaffinity and film-forming properties. Food and other fields have a wide range of applications. [0003] The industrial production of D-glucosamine hydrochloride is based on chitin prepared from crustaceans as raw material, and the D-glucosamine hydrochloride is prepared by hydrochloric acid hydrolysis, cooling, crystallization, separation and other procedures. However, in the production process, about 3.4-4.25 tons of hydrochloric acid-acetic acid waste liquid will be produced for every 1 ton of D-glucosamine hydrochloride produced. These waste liquids are directly discharged to the environment for treatment, which not onl...

Claims

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Application Information

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IPC IPC(8): C01B7/01C07C53/08C07C51/42
Inventor 张光旭林荣业李延峰徐君义
Owner YUHUAN MARINE BIOCHEM
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