Process for arsenic removal of 1-hydroxy ethylidene-1,1-diphosphonic acid

A technology of hydroxyethylene diphosphonic acid and process, which is applied in the field of arsenic removal technology of hydroxyethylene diphosphonic acid, can solve the problems of increasing production cost, being difficult to purchase, unfavorable for practical application, etc., and achieves low price and low cost. Effect

Inactive Publication Date: 2011-05-25
SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, there is no process for dearsenic treatment of aminotrimethylene phosphonic acid, only a patent No. 200810230638.9 discloses a hydroxyethylene diphosphonic acid with an arsenic content ≤ 3ppm and its preparation process , the process uses ammonium thioacetate as the arsenic removal reagent in the production process of hydroxyethylidene diphosphonic acid, but ammonium thioacetate is expensive and difficult to purchase, and there are few domestic manufacturers, basically relying on imports, and the method uses The amount of ammonium thioacetate is too large, which greatly increases the production cost, which is not conducive to the practical application in industrialized production

Method used

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  • Process for arsenic removal of 1-hydroxy ethylidene-1,1-diphosphonic acid

Examples

Experimental program
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Effect test

Embodiment 1

[0048] The feeding amount of HEDP is 600kg, the arsenic removal agent phosphorus pentasulfide (P2S5) is 0.2kg, the amount of activated carbon is 0.6kg, the temperature is kept at 50°C, and the holding time is 2 hours.

[0049] Add 600kg HEDP into the kettle, start stirring after the addition is complete, feed steam into the reactor jacket to heat the temperature of the material in the kettle to 50±2°C, add 0.2kg of arsenic removal agent and 0.6kg of activated carbon at a time from the special feeding port, after adding Rinse the feeding port with 1kg of pure water, keep it warm for 2 hours after adding, and keep the temperature at 50±2°C; then filter the HEDP into another kettle, heat the filtered HEDP to 80°C, Steam under pressure for 2 hours, analyze the activity before the end of external steaming, dilute with pure water according to the activity content of HEDP, cool down to 50°C and discharge. The assayed arsenic content was less than 1mg / L.

Embodiment 2

[0051] The feeding amount of HEDP is 600kg, the arsenic removal agent phosphorus pentasulfide (P2S5) is 0.4kg, and the activated carbon is 0.6kg, and the temperature is kept at 25°C for 4 hours.

[0052] Add 600kg HEDP into the kettle, start stirring after the addition is complete, feed steam into the jacket of the reaction kettle to heat the temperature of the material in the kettle to 25±2°C, add 0.4kg of arsenic removal agent and 0.6kg of activated carbon at a time from the special feeding port, after adding Rinse the feeding port with 1kg of pure water, and keep it warm for 4 hours after adding, at a temperature of 25±2°C; then filter the HEDP into another kettle, heat the filtered clean HEDP to 80°C, and pull Negative pressure external steaming for 2 hours, analyze the activity before the external steaming ends, add pure water to dilute according to HEDP activity, cool down to 40°C and discharge. The assayed arsenic content was less than 1mg / L.

Embodiment 3

[0054] The feeding amount of HEDP is 600kg, the arsenic removal agent phosphorus pentasulfide (P2S5) is 0.6kg, and the activated carbon is 0.6kg, and the temperature is kept at 25°C for 2 hours.

[0055] Add 600kg HEDP into the kettle, start stirring after the addition is complete, feed steam into the jacket of the reaction kettle to heat the temperature of the material in the kettle to 25±2°C, add 0.4kg of arsenic removal agent and 0.6kg of activated carbon at a time from the special feeding port, after adding Rinse the feeding port with 1kg of pure water, and keep warm for 2 hours after adding, at a temperature of 25±2°C; then filter HEDP into another kettle, heat the filtered clean HEDP to 80°C, and pull Steam under negative pressure for 2 hours, analyze the activity before the end of external steaming, add pure water to dilute according to HEDP activity, cool down to 45°C and discharge. The assayed arsenic content was less than 1mg / L.

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Abstract

The invention discloses a process for the arsenic removal of 1-hydroxy ethylidene-1,1-diphosphonic acid, which ensures low production cost. The process comprises the following operating steps of: adding 400 to 1,000 weight parts of 1-hydroxy ethylidene-1,1-diphosphonic acid free from arsenic removal treatment into a reaction kettle, introducing vapor to adjust the temperature of the material in the kettle to 20 to 70 DEG C by using a reaction kettle clamping sleeve, adding 0.1 to 1 weight part of phosphorus pentasulfide serving as an arsenic removal agent, adding 0.2 to 2 weight parts of activated carbon, washing a charging hole by using 0.5 to 2 weight parts of pure water after the charging is finished, preserving the heat for 1 to 5 hours at the temperature of 20 to 70 DEG C, filtering the 1-hydroxy ethylidene-1,1-diphosphonic acid (HEDP), heating the filtered clean 1-hydroxy ethylidene-1,1-diphosphonic acid to 80 DEG C, performing external evaporation for 1 to 3 hours under negative pressure, and before the external evaporation is finished, performing activity analysis, adding the pure water for dilution according to an activity result, and introducing cooling water to reduce the temperature of the material in the kettle to 40 to 50 DEG C by using the reaction kettle clamping sleeve and performing discharging.

Description

technical field [0001] The invention relates to a process for removing arsenic, in particular to a process for removing arsenic of hydroxyethylene diphosphonic acid. Background technique [0002] Hydroxyethylidene diphosphonic acid, also known as hydroxyethylidene diphosphonic acid, has a molecular formula of C2H8O7P2 and its English abbreviation is HEDP. Hydroxyethylene diphosphonic acid is an organic phosphonic acid scale and corrosion inhibitor, which can form stable complexes with various metal ions such as iron, copper, zinc, etc., and dissolve oxides on the metal surface. It can still play a good role in corrosion and scale inhibition. It is still very stable at high pH, ​​not easy to be hydrolyzed, and not easy to decompose under general light and heat conditions. Its acid and alkali resistance and chlorine oxidation resistance are better than other organic phosphonic acids (salts). It can form a six-membered ring chelate with metal ions in water, especially calcium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/38
Inventor 程终发王忠英齐晓靓孙宝季王东海王燕平
Owner SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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