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Production technology of food-grade phosphoric acid with hydrochloric acid method

A production process, food-grade technology, applied in the direction of phosphoric acid, phosphorus oxyacid, phosphorus compounds, etc., can solve the problems of unseen industrialized production, difficult filtration, poor washing effect, etc., achieve easy transportation and processing, simple removal process, High utilization effect

Active Publication Date: 2012-06-27
西安君正工程科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical application, this method has disadvantages such as difficult filtration and poor washing effect, and has not been realized in industrialized production so far.

Method used

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  • Production technology of food-grade phosphoric acid with hydrochloric acid method
  • Production technology of food-grade phosphoric acid with hydrochloric acid method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Take 200g with P 2 o 5 About 20% of the poor phosphate rock, crushed to more than 20 mesh and added to the beaker; add 400ml of 23wt% hydrochloric acid and a part of water, react under stirring conditions for 20 minutes, then add 6wt% Na 2 S solution 14ml carries out pre-removal of impurities, then adds 0.1wt% flocculant 10ml flocculation precipitation, then filters with filter paper; Carry out extraction to remove iron, extraction temperature is 20~30 ℃, extraction phase: water phase=1: 1, gained raffinate water phase is the dilute phosphoric acid of iron removal; Then, use the mixed solvent of tributyl phosphate and kerosene as extractant to Deferric dilute phosphoric acid carries out ten-stage extraction, extraction temperature is 20-30 ℃, by volume ratio, tributyl phosphate: kerosene=1: 1, water phase during extraction: organic phase=1: 4; Then, to extraction, obtain The organic phase carries out five-stage washing with the dilute phosphoric acid solution of 15wt%...

Embodiment 2

[0056] 100 kg of crushed phosphate rock powder, P 2 o 5 The content is about 20%, put it into the reaction tank, add 0.2m hydrochloric acid with a mass fraction of 23% 3 Carry out acidolysis, add 7L mass fraction after 20 minutes under stirring condition and be the Na of 6% 2 S solution carries out pre-removal of impurities, then adds 0.1wt% flocculant 3.5L flocculation precipitation, then filters; With volume percentage, N235: isooctyl alcohol: kerosene=15%: 15%: 70% mixed solvent is carried out to filtrate Extraction and iron removal, extraction temperature is 20~30 ℃, extraction phase: water phase=1:1, the obtained raffinate water phase is dilute phosphoric acid for iron removal; then, by volume ratio, tributyl phosphate: kerosene=1:1 Mixed solvent carries out ten-stage extraction to dilute phosphoric acid for iron removal, and extraction temperature is 20~30 ℃, and water phase during extraction: organic phase=1: 5; Carry out five-stage washing to the organic phase that e...

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Abstract

The invention discloses a production technology of food-grade phosphoric acid with hydrochloric acid method. According to the invention, hydrochloric acid acidolysis process is used as a base, heavy metal impurities are removed by prepurification and subsequent purification, and simultaneously tributyl phosphate with simple components and stable property is used as an extractant to complete extraction, the extraction effect is good, and back extraction process of dilute hydrochloric acid is combined, the utilization rate of the extractant is high. The whole extraction and back extraction are completed at normal temperature, thus the technology is especially suitable for preparing food-grade phosphoric acid in industrial production. The liquid-liquid extraction technology has strong controllability, and high extraction rate and high impurity removal rate. The content of H3PO4 in a finished product of phosphoric acid reaches more than 75 wt%. The finished product of phosphoric acid has good quality and can be used in food industry without purification, and is suitable for lean phosphate rocks or rich phosphate rocks.

Description

technical field [0001] The invention relates to a production process of high-purity phosphoric acid, in particular to a hydrochloric acid production process of food-grade phosphoric acid used in the food industry, and belongs to the field of chemical product processing. Background technique [0002] Phosphoric acid is an important chemical raw material, widely used in fertilizer industry, food industry, water treatment industry, electronics industry, coating industry and other fields. Food-grade phosphoric acid is also a cheap sour agent, which is widely used as a food additive in the production process of dairy products, meat products, aquatic products and various beverages. Food-grade phosphoric acid is in great demand domestically and internationally, but its preparation methods have been relatively backward. [0003] The preparation of food-grade phosphoric acid generally uses hot-process phosphoric acid or wet-process phosphoric acid as raw materials. Thermal phosphor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/46
CPCC01B25/22C01B25/2212C01B25/234C01B25/46
Inventor 杨站平
Owner 西安君正工程科技有限公司
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