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Hydroxy ethylidene diphosphonic acid with content of greater than or equal to 90 percent and process for making same

A technology of hydroxyethylene diphosphonic acid and process, which is applied in the field of hydroxyethylene diphosphonic acid and its preparation process, and can solve the problems of difficult packaging, waste, large storage and transportation energy consumption, etc.

Inactive Publication Date: 2005-11-23
CHANGZHOU JIAYOU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the hydroxyethylene diphosphonic acid solution, that is, the liquid hydroxyethylene diphosphonic acid in the present invention, there are many shortcomings such as packaging difficulties, large storage and transport energy consumption in circulation, and difficult control of on-site application. It has caused a lot of waste to the economy and society

Method used

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  • Hydroxy ethylidene diphosphonic acid with content of greater than or equal to 90 percent and process for making same

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Experimental program
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specific Embodiment approach

[0035] One of the specific embodiments, a preparation process of hydroxyethylene diphosphonic acid with a content of 91%, uses commercially available hydroxyethylene diphosphonic acid with a liquid weight percentage of 50% as raw material, and follows the following steps: Steps to proceed:

[0036] 1. Prepare materials, take 1000kg liquid hydroxyethylene diphosphonic acid and put it into the reaction kettle;

[0037] 2. Slowly add 15g of sodium acetate;

[0038] 3. Stir. Stir slowly by hand in the same direction, and observe its crystallization status at any time;

[0039] 4. Slowly add 25g of absolute ethanol and stir slowly;

[0040] 5. Stand still for 10 to 12 hours, and dehydrate with a centrifugal dehydrator;

[0041] 6. Use 70°C hot air to dry the dehydrated solid hydroxyethylidene diphosphonic acid in reverse convection to obtain a solid hydroxyethylidene diphosphonic acid product with a content of 91%.

[0042] 7. Packaged and marketed after testing.

[0043] The...

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Abstract

The invention discloses a hydroxy ethylidene diphosphonic acid (HEDP) with content of greater than or equal to 90 percent and process for preparation, wherein the product comprises (by weight percentage) 1-Hydroxyethylidene-1,1-diphosphonic acid 90-98%, unavoidable impurity substance 1-2%, and balancing water. The preparing process comprises the steps of stock preparation, charging sodium acetate as crystal nucleon, agitating, charging anhydrous alcohol as crystallizing aid agent, dewatering, and drying.

Description

technical field [0001] The invention relates to a hydroxyethylene diphosphonic acid with a content ≥ 90% and a preparation process thereof, belonging to the technical field of chemical industry. Background technique [0002] The hydroxyethylidene diphosphonic acid involved in the present invention is hydroxyethylidene diphosphonic acid, its English abbreviation is HEDP, and its structural formula is: [0003] [0004] Hydroxyethylene diphosphonic acid is a corrosion and scale inhibitor widely used in oil field production water, steam turbine cooling circulating water and many other water treatments. It is also an intermediate of printing and dyeing chelating and dispersing agents. [0005] Existing at present such as Chinese patent authorization announcement number 1043044C and publication number are the production method of two hydroxyethylene diphosphonic acids of CN1418883A, the content of the hydroxyethylene diphosphonic acid of the prepared hydroxyethylene diphosphon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/38
Inventor 吴林华赵荣明陈志龙
Owner CHANGZHOU JIAYOU CHEM CO LTD