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Method for recycling waste hydrochloric acid in process of producing chitin

A technology of production process and waste hydrochloric acid, which is applied in the regeneration and utilization of waste hydrochloric acid in the production process of chitin, and in the field of regeneration and utilization of waste hydrochloric acid, to achieve the effect of ensuring the efficiency and effect of decalcification and reducing the amount of production

Active Publication Date: 2015-03-25
山西道一生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The more cycles, the more hydrochloric acid remaining in the waste hydrochloric acid solution. As the concentration of hydrochloric acid in the acid solution decreases, the reaction efficiency and decalcification effect decrease, so the decalcification process takes 10-15 hours
At the end of the hydrochloric acid dynamic cycle, sulfuric acid is added to the waste water, filtered to obtain calcium sulfate, and the acid waste water is used to return to the acid solution. The patent document only realizes the reuse of acid waste water

Method used

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  • Method for recycling waste hydrochloric acid in process of producing chitin
  • Method for recycling waste hydrochloric acid in process of producing chitin

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] second recycling

[0036] Get the waste hydrochloric acid solution after decalcification of the regenerated hydrochloric acid solution for the first time, filter and remove chitin, fiber, stone solid foreign matter in the waste hydrochloric acid solution, record the calcium ion concentration in this hydrochloric acid solution as 0.17 moles per liter, take the waste hydrochloric acid solution Add 800 liters of hydrochloric acid solution into an enamel reaction kettle with a volume of 2 cubic meters, start the motor to stir, and slowly add 16.4 kilograms of sulfuric acid solution with a concentration of 98% according to the molar ratio of calcium ions and sulfate radicals at 1:1.2, and stir while adding , the stirring speed is 30 revolutions per minute, the sulfuric acid is added within 30 minutes, and after the sulfuric acid is added, the stirring reaction is continued for 30 minutes. After the reaction was finished, the stirring was stopped, and the mixture was allowed ...

Embodiment 2

[0042] second recycling

[0043] Take the waste hydrochloric acid solution after decalcification of the regenerated hydrochloric acid for the first time, filter and remove chitin, fibers, stone solid impurities in the waste hydrochloric acid solution, obtain the decalcified waste hydrochloric acid solution, and measure the calcium ion concentration in this hydrochloric acid solution to be 0.16 Mole per liter, take 800 liters of waste hydrochloric acid solution, add it to an enamel reaction kettle with a volume of 2 cubic meters, start the motor to stir, and slowly add 90% sulfuric acid solution with a concentration of 7.0 kg, and stirred while adding, the stirring speed was 50 rpm, and the sulfuric acid was added within 30 minutes. After the sulfuric acid was added, the stirring reaction was continued for 15 minutes. After the reaction was finished, the stirring was stopped, and the mixture was allowed to stand for 1 hour, and the calcium sulfate precipitate was filtered throu...

Embodiment 3

[0053] second recycling

[0054] Take the waste hydrochloric acid solution after decalcification of the regenerated hydrochloric acid for the first time, filter and remove chitin, fibers, stone solid impurities in the waste hydrochloric acid solution, obtain the decalcified waste hydrochloric acid solution, and measure the calcium ion concentration in this hydrochloric acid solution to be 0.16 Mole per liter, take 1700 liters of waste hydrochloric acid solution, add it to an enamel reaction kettle with a volume of 3 cubic meters, start the motor to stir, and slowly add 90% sulfuric acid solution 29.5 kg, stirring while adding, the stirring speed is 50 revolutions per minute, and the sulfuric acid is added in 30 minutes, and after the sulfuric acid is added, the stirring reaction is continued for 25 minutes. After the reaction was finished, the stirring was stopped, and the mixture was allowed to stand for 2 hours, and the calcium sulfate precipitate was removed by filtering th...

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Abstract

The invention belongs to the technical field of recycling of industrial wastes, and particularly discloses a method for recycling waste hydrochloric acid in the process of producing chitin. According to the method, the waste hydrochloric acid solution from first-time decalcification is regenerated, the regenerated hydrochloric acid solution is directly used for second-time decalcification, the waste hydrochloric acid solution from second-time decalcification is regenerated, the regenerated hydrochloric acid solution is used for third-time decalcification, and the waste hydrochloric acid solution is recycled in turn. The reaction vitality of the hydrochloric acid solution subjected to reaction each time can be recovered to the level of fresh hydrochloric acid, the recycling of hydrochloric acid is really realized, and more importantly, no additional hydrochloric acid is added during decalcification in addition to the first-time decalcification, but the decalcification efficiency and effect are guaranteed. The output of waste water from the final production step can be reduced, and the clean production of the chitin can be realized.

Description

technical field [0001] The invention belongs to the technical field of recycling of industrial waste, in particular to a method for recycling waste hydrochloric acid, and more particularly to a method for recycling waste hydrochloric acid in the production process of chitin. Background technique [0002] Chitin is also known as chitin and chitin, and its chemical name is β-(1-4)-2-acetylamino-2-deoxy-D-glucose. It has important applications in the fields of textiles, chemicals, food, and medicine. prospect. Chitin mainly exists in lower plant fungi, shells of crustaceans such as shrimps, crabs, and insects, and cell walls of fungi. At present, the main raw materials for industrial production are shrimp and crab shells. [0003] The production process of chitin mainly has two processes. The first process is the decalcification process. The ash in shrimp and crab shells is mainly calcium carbonate. The removal process of calcium carbonate is to add shrimp and crab shells to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08
Inventor 彭元怀王正琦王标诗
Owner 山西道一生物科技有限公司