Treating and utilizing technology of waste liquid from Solvay process

A technology for waste liquid treatment and ammonia alkali is applied in the field of calcium stearate production, which can solve the problems of limitation, large solubility, and reduce the viscosity of reaction materials, so as to reduce the cost of calcium raw materials, solve the discharge problem, and achieve the effect of high comprehensive economic benefits.

Active Publication Date: 2016-04-20
CHINA TIANCHEN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large gelatinization energy of sodium soap and low solubility, it is easy to combine with stearic acid to form acidic soap. A large amount of water is needed to reduce the viscosity of the reaction material. 1 ton of product needs to discharge about 15 tons of waste water. With the improvement of environmental protection requirements, this method is limited.

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  • Treating and utilizing technology of waste liquid from Solvay process
  • Treating and utilizing technology of waste liquid from Solvay process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The ammonia alkali waste liquid mainly containing 9.5% calcium chloride and 4.7% sodium chloride is initially filtered with a precision of 80 mesh, and then filtered with a precision of 200 mesh to obtain a clarified filtrate; adding cleaning liquid to the obtained filtrate to dilute, and then heating And when keeping the temperature at 60°C, add stearic acid according to the mass ratio of the filtrate to stearic acid at 1.7, and stir to dissolve the stearic acid thoroughly; The mass ratio of sodium solution and stearic acid is 0.9; Constantly stirring takes place saponification and salt-forming reaction to generate calcium stearate, and sodium hydroxide is converted into sodium chloride and exists in the solution; when the free acid content is 0.47%, it is cooled to room temperature to make The generated calcium stearate is crystallized and dehydrated; the calcium stearate dehydration solution mainly contains sodium chloride, which is sent to the ammonia-alkali plant as...

Embodiment 2

[0049] The ammonia alkali waste liquid mainly containing 9.5% calcium chloride and 4.7% sodium chloride is initially filtered with a precision of 80 mesh, and then filtered with a precision of 210 mesh to obtain a clarified filtrate; adding cleaning liquid to the obtained filtrate to dilute, and then heating And when keeping the temperature at 74°C, add stearic acid according to the mass ratio of the filtrate to stearic acid at 1.9, and stir to completely dissolve the stearic acid; The mass ratio of sodium solution and stearic acid is 0.8; Constantly stirring takes place saponification and salt-forming reaction to generate calcium stearate, and sodium hydroxide is converted into sodium chloride and exists in the solution; when the free acid content is 0.44%, it is cooled to room temperature to make The generated calcium stearate is crystallized and dehydrated; the calcium stearate dehydration solution mainly contains sodium chloride, which is sent to the ammonia-alkali plant as...

Embodiment 3

[0051] By mainly containing 9.5% calcium chloride and 4.7% sodium chloride ammonia alkali waste liquid, preliminarily filter with 90 mesh precision, filter again with 180 mesh precision, obtain clarification filtrate; Add cleaning solution to the obtained filtrate and dilute, then When heating and keeping the temperature at 92°C, add stearic acid according to the mass ratio of the filtrate to stearic acid at 2.1, and stir to dissolve the stearic acid completely; add 18% sodium hydroxide solution to it, the hydrogenated The mass ratio of sodium oxide solution to stearic acid is 1.2; Constantly stirring takes place saponification and salt-forming reaction to generate calcium stearate, and sodium hydroxide is converted into sodium chloride and exists in the solution; when the free acid content is 0.41%, it is cooled to room temperature, Make the generated calcium stearate crystallize and dehydrate; the calcium stearate dehydration solution mainly contains sodium chloride, and is s...

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Abstract

The invention provides a treating and utilizing technology of waste liquid from Solvay process. The treating and utilizing technology adopts waste liquid from Solvay process, stearic acid and caustic soda as raw materials; calcium chloride in the waste liquid from Solvay process is converted into a high-value product, namely calcium stearate; filtered waste liquid from Solvay process is sufficiently utilized in the process. According to the invention, comprehensive utilization of the waste liquid from Solvay process is realized sufficiently; the cost of calcium serving as a raw material in the production process of calcium stearate is reduced; the waste liquid discharging problem of the production process of calcium stearate is solved. Practical production tests show that to produce 1 ton of calcium stearate, about 2 tons of the waste liquid from Solvay process can be treated. The treating and utilizing technology has the advantages that the raw materials are wide in sources, and low in cost; the operability is high; industrialization is easy to realize; in the whole technological process, water is saved, consumption is reduced, and a higher comprehensive economic benefit can be realized.

Description

technical field [0001] The invention relates to the treatment and utilization of soda ash waste liquid produced by the ammonia-soda process, in particular to a process for producing calcium stearate by using the ammonia-soda waste liquid. Background technique [0002] At present, the ammonia-soda method is widely used in large-scale soda ash production in industry. This method uses salt and limestone as the main raw materials and ammonia as the intermediate auxiliary material. The production process is carried out in the gas-liquid phase. It has the advantages of abundant raw material sources, low cost, good product quality, and large-scale continuous production. According to incomplete statistics, as of 2013, the national annual output of ammonia-soda soda ash has exceeded 20 million tons. [0003] In the process of making soda ash by ammonia-soda method, about 10 tons of waste liquid will be produced for every ton of soda ash produced. For the discharge of waste liquid, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/41C07C53/126
CPCC07C51/412C07C53/126
Inventor 孙顺平朱二民赵兵张猛张进治耿尧辰
Owner CHINA TIANCHEN ENG
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