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Preparation method of low chloride 2-hydroxyphosphonoacetic acid

A technology of hydroxyphosphonoacetic acid and glyoxylic acid, applied in chemical instruments and methods, compounds of Group 5/15 elements of the periodic table, organic chemistry, etc., to achieve a broad market and expand application fields

Active Publication Date: 2015-07-08
SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limits the application of 2-hydroxyphosphonoacetic acid in some special fields that have strict requirements on chloride ion content, such as electronics industry and membrane treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 2000kg of 40% aqueous solution of glyoxylic acid, 400kg of reverse osmosis water, and 100g of 98% concentrated sulfuric acid into the reaction kettle, and start stirring. After stirring evenly, control the temperature to ≤30°C, and slowly add 930kg of phosphorous acid crystals. After the phosphorous acid crystals are added, the temperature is raised to 90°C at a rate of 20°C / h, and the reaction is kept for 18 hours. Detect phosphorus content < 3%, chloride ion content ≤ 3ppm, cool down to below 60°C, add reverse osmosis water to adjust solid content.

Embodiment 2

[0024] Embodiment 2 (best embodiment)

[0025] Add 2000kg of 40% aqueous solution of glyoxylic acid, 400kg of reverse osmosis water, and 500g of 98% concentrated sulfuric acid into the reaction kettle, and start stirring. After stirring evenly, control the temperature to ≤30°C, and slowly add 975kg of phosphorous acid crystals. After the phosphorous acid crystals are added, the temperature is raised to 100°C at a rate of 50°C / h, and the reaction is kept for 18 hours. Detect phosphorus content < 3%, chloride ion content ≤ 3ppm, cool down to below 60°C, add reverse osmosis water to adjust solid content.

Embodiment 3

[0027] Add 2000kg of 50% aqueous solution of glyoxylic acid, 400kg of reverse osmosis water, and 500g of 98% concentrated sulfuric acid into the reaction kettle, and start stirring. After stirring evenly, control the temperature to ≤30°C, and slowly add 1210kg of phosphorous acid crystals. After the phosphorous acid crystals are added, the temperature is raised to 100°C at a rate of 50°C / h, and the reaction is kept for 18 hours. Detect phosphorus content < 3%, chloride ion content ≤ 3ppm, cool down to below 60°C, add reverse osmosis water to adjust solid content.

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Abstract

The invention provides a preparation method of low chloride 2-hydroxyphosphonoacetic acid. The preparation method has the obvious advantages that effective control of chloride ions in raw materials is achieved by using crystalline phosphorous acid instead of common phosphorous acid; introduction of chloride ions in the production process is further reduced by using sulfuric acid as a catalyst instead of hydrochloric acid; the concentration of chloride ions in the 2-hydroxyphosphonoacetic acid product prepared by the process is not more than 3ppm and meets the requirements of different application fields.

Description

technical field [0001] The invention belongs to the field of synthesis of water treatment agents and provides a preparation method of low-chlorine 2-hydroxyphosphonoacetic acid. Background technique [0002] Adding low-dose corrosion inhibitors to the circulating cooling water system can control the corrosion rate of metals within the allowable range, which can protect the entire cooling water system, and is economical and practical. It is the most widely used method at present. There are many kinds of commonly used corrosion inhibitors. Although chromate can kill harmful microorganisms such as bacteria and algae in circulating cooling water, chromium is toxic to many aquatic organisms and humans, and will pollute the natural environment; polyphosphate contains Phosphine is high, and its discharge will cause eutrophication of water bodies and pollute the environment; the cost of molybdate and other applications is too high; nitrite is not suitable for corrosion inhibitor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F9/38
Inventor 齐晓婧程终发王燕平万振涛刘全华
Owner SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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