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Methylene phosphonic carboxylic acid, its preparation process and its application in water treatment

A technology of phosphine carboxylic acid and methylidene is applied in the field of preparation of methylidene phosphine carboxylic acid water stabilizer, and can solve the problems of low yield and the like

Inactive Publication Date: 2004-09-01
RES INST OF BEIJING YANSHAN PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcoming is that productive rate is lower when preparing GDMP with the above-mentioned method

Method used

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  • Methylene phosphonic carboxylic acid, its preparation process and its application in water treatment
  • Methylene phosphonic carboxylic acid, its preparation process and its application in water treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 73.57g (0.5mol) of glutamic acid and 70mL of water into a four-necked flask equipped with a stirrer, reflux condenser, constant pressure dropping funnel and thermometer, and start stirring to fully dissolve glutamic acid. At room temperature (20°C), slowly add 137.5g (1.0mol) of phosphorus trichloride dropwise to the bottle, and control the drop within 2 hours, and keep the temperature in the four-necked flask not higher than 60°C with a cold water bath. After the phosphorus trichloride is added dropwise, raise the temperature to 90°C, add 121.6g (1.5mol) formaldehyde solution dropwise into the bottle, keep the temperature at 90-95°C for 4 hours, until no hydrogen chloride is released from the upper end of the reflux cooler. Cool to obtain glutamic acid dimethylphosphonic acid (EDMP) aqueous solution, concentrate and precipitate 160.0 g of EDMP under the action of methanol, and the product yield is 95.5%.

Embodiment 2

[0018] Except that the reaction time is 7h, all the other conditions are the same as in Example 1, and the results are listed in Table 1.

Embodiment 3

[0020] Except that the reaction time is 10h, all the other conditions are the same as in Example 1, and the results are listed in Table 1.

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Abstract

A methylene phosphocarboxylic acid as water quality stabilizer is prepared from carboxy-contained amine, PCl3 (or phosphonous acid and concentrated hydrochloric acid) and water through heating and adding solution of formaldehyde. It has high output rate.

Description

technical field [0001] The invention relates to a preparation method of a methylene phosphonic acid water quality stabilizer, namely a water quality stabilizer containing both carboxylic acid groups and phosphonic acid groups (hereinafter referred to as phosphine carboxylic acid) in one molecule. Background technique [0002] In the circulating cooling water system, there are mainly three problems of scaling, corrosion and microbial hazards. The most convenient and effective way to prevent system scaling and corrosion is to add corrosion and scale inhibitors to the circulating cooling water. At present, the formulas commonly used in the treatment of circulating cooling water in China are mostly phosphorus-based formulas, and their main agents are corrosion and scale inhibitors containing phosphonic acid groups. They mainly include: hydroxyethylidene diphosphonic acid (HEDP), aminotrimethylene phosphonic acid (ATMP), ethylenediaminetetramethylenephosphonic acid (EDTMPS), pho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/00C02F5/08C07F9/38
Inventor 王岽郦和生张伟张士义郭红卫张春原
Owner RES INST OF BEIJING YANSHAN PETROCHEM
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