Continuous production process for amino trimethylene phosphonic acid

A technology of amino trimethylene phosphonic acid and production process, which is applied in the field of continuous production technology of amino trimethylene phosphonic acid, can solve the problems of long process flow, unstable product quality and the like, and achieves advanced technology, stable product quality, and high production efficiency. short cycle effect

Active Publication Date: 2013-09-04
SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in industrial production, aminotrimethylene phosphonic acid is prepared by the production method of batch reactor, which has the disadvantages of long process flow and unstable product quality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Add ammonium chloride, phosphorous acid, and formaldehyde with a molar ratio of 1:1.8:2.5 into the mixing tank, add 50% reverse osmosis water, and mix well at 30~35°C.

[0021] (2) Pump the mixed materials into a tubular reactor with a flow rate of 600 L / h. The tubular reactor is a graphite coil reactor with a diameter of 50 cm and a length of 180 m, and reacts in an oil bath at 105 ° C.

[0022] (3) The mixture obtained from the reaction enters the spray absorption tower, sprays from the top of the tower and contacts with the rising steam with a flow rate of 800L / h and a temperature of 180°C, and the aqueous solution of aminotrimethylene phosphonic acid enters the storage tank at the bottom of the tower. Ammonium, formaldehyde and hydrogen chloride enter the rectification device from the top of the tower for rectification and separation.

Embodiment 2

[0024] (1) Add ammonium chloride, phosphorous acid, and formaldehyde with a molar ratio of 1:2.0:2.8 to the mixing tank, add 80% reverse osmosis water, and mix well at 30~35°C.

[0025] (2) Pump the mixed materials into a tubular reactor with a flow rate of 800 L / h. The tubular reactor is a graphite coil reactor with a diameter of 55 cm and a length of 150 m, and reacts in an oil bath at 110° C.

[0026] (3) The mixture obtained from the reaction enters the spray absorption tower, sprays from the top of the tower and contacts with the rising steam with a flow rate of 1000L / h and a temperature of 160°C, and the aqueous solution of aminotrimethylenephosphonic acid enters the bottom storage tank of the tower, and the unreacted chlorination Ammonium, formaldehyde and hydrogen chloride enter the rectification device from the top of the tower for rectification and separation.

Embodiment 3

[0028] (1) Add ammonium chloride, phosphorous acid, and formaldehyde with a molar ratio of 1:2.3:3.0 to the mixing tank, add 80% reverse osmosis water, and mix well at 30~35°C.

[0029] (2) Pump the mixed materials into a tubular reactor with a flow rate of 800 L / h. The tubular reactor is a graphite U-shaped tubular reactor with a diameter of 60 cm and a length of 50 m, and reacts in an oil bath at 115 ° C.

[0030] (3) The mixture obtained from the reaction enters the spray absorption tower, sprays from the top of the tower and contacts with the rising steam with a flow rate of 1000L / h and a temperature of 160°C, and the aqueous solution of aminotrimethylenephosphonic acid enters the bottom storage tank of the tower, and the unreacted chlorination Ammonium, formaldehyde and hydrogen chloride enter the rectification device from the top of the tower for rectification and separation.

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Abstract

The invention relates to a continuous production process for an amino trimethylene phosphonic acid. The continuous production process comprises the steps of adding ammonium chloride, phosphorous acid and formaldehyde in a mixing kettle according to a certain molar ratio; adding reverse osmosis water; mixing uniformly at the temperature of 35 DEG C; pumping into a tubular reactor at a certain flow rate; reacting thoroughly; then introducing into a spraying absorption tower; and spraying from the top of the tower so as to contact with rising high temperature water vapor, condensing amino trimethylene phosphonic acid being cooled to enter the tower unreacted ammonium chloride, formaldehyde and hydrogen chloride vapor entering a rectification apparatus to be separated by rectification from the top of the tower. Continuous feeding and discharging production process is employed, and conventional intermittent production process employing single kettle mixing material is changed, so that utilization rate of the equipment is increased; production period is shorten; productivity is increased; performance is more stable; comprehensive energy consumption is reduced; and large-scale industrialized production can be achieved easily.

Description

technical field [0001] The invention belongs to the technical field of industrial water treatment, and in particular relates to a continuous production process of aminotrimethylene phosphonic acid. Background technique [0002] Aminotrimethylene phosphonic acid is an organic phosphonic acid scale and corrosion inhibitor, which can form stable complexes with iron, copper, zinc and other metal ions, and can dissolve oxides on the metal surface. Amino trimethylene phosphonic acid is generally used as an anti-scaling agent for circulating cooling water, oil field water injection and printing and dyeing water, as well as a corrosion inhibitor and anti-scaling agent in boiler water equipment. In addition, it can be used in conjunction with various buffers and scale inhibitors. It has a good synergistic effect with polycarboxylate, etc., which can increase the effect of corrosion and scale inhibition, and can also be used as a cleaning agent to remove grease on metal surfaces. It...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/38
Inventor 齐晓婧程终发万振涛张秀华宋盟盟任泽旭
Owner SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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