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Production process of low molecular weight polysodium acrylate as papermaking dispersant

A technology of sodium polyacrylate and low molecular weight, applied in fiber dispersant addition, paper, etc., can solve the problems of rising production cost, isopropanol volatilization, environmental pollution, etc., and achieve shortened production cycle, reduced production cost and energy consumption Reduced effect

Inactive Publication Date: 2007-06-27
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is easy to cause part of the isopropanol to volatilize in the whole production process, and the distillation operation is also difficult to make all the solvents recover. Therefore, the loss of isopropanol increases the production cost and pollutes the environment. In addition, due to a large amount of The presence of isopropanol relatively reduces equipment utilization, mass transfer and heat transfer efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0007] Example 1: First, dissolve 20 kg of ammonium persulfate in 120 kg of tap water to obtain an aqueous solution of ammonium persulfate; secondly, add 200 kg of tap water to a 1000L enamel batch reaction kettle, and raise the temperature to 75±2°C; Add 275 kg of industrial pure acrylic acid, 140 kg of ammonium persulfate aqueous solution and 11 kg of mercaptoethanol, the reaction temperature is controlled at 75-85 °C, and the dropwise addition time is 2 hours. Try to keep different materials and drop them at the same time; Incubate at 80±2°C for half an hour, add 40% NaOH solution to adjust the pH to 7-8 to obtain the finished product.

example 2

[0008] Example 2: First, dissolve 20 kg of ammonium persulfate in 120 kg of tap water to obtain an aqueous solution of ammonium persulfate; secondly, add 200 kg of tap water to a 1000L enamel batch reaction kettle, and raise the temperature to 75±2°C; Add 275 kilograms of industrial pure acrylic acid, 140 kilograms of ammonium persulfate aqueous solution and 13.75 kilograms of mercaptoethanol, the reaction temperature is controlled at 75-85 ° C, and the dropping time is 2 hours. Incubate at 80±2°C for half an hour, add 40% NaOH solution to adjust the pH to 7-8 to obtain the finished product.

example 3

[0009] Example 3: First, dissolve 20 kg of ammonium persulfate in 120 kg of tap water to obtain an aqueous solution of ammonium persulfate; secondly, add 200 kg of tap water to a 1000L enamel batch reaction kettle and raise the temperature to 75±2°C; Add 275 kilograms of industrial pure acrylic acid, 140 kilograms of ammonium persulfate aqueous solution and 16.5 kilograms of mercaptoethanol, the reaction temperature is controlled at 75-85 ℃, and the dropwise addition time is 2 hours. Incubate at 80±2°C for half an hour, add 40% NaOH solution to adjust the pH to 7-8 to obtain the finished product.

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PUM

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Abstract

The present invention discloses production process of low molecular weight polysodium acrylate as papermaking dispersant. The process includes the following steps: dissolving ammonium persulfate of 20 kg in water of 120 kg to obtain water solution of ammonium persulfate; adding water of 200 kg in reactor and heating to 75+ / -2deg.c; stirring, dropping industrial pure acrylic acid in 275 kg, water solution of ammonium persulfate and mercapto ethanol in 4-6 wt% of acrylic acid monomer, and reaction at 75-85 deg.c for 2 hr; and maintaining at 80+ / -2 deg.c for 0.5 hr and adding 40 % concentration water solution of NaOH to regulate pH to 7-8 and obtain the product. The present invention adopts mercapto ethanol as molecular weight regulator, and has raised reaction apparatus utilizing rate and raised heat transfer and mass transfer efficiency, simple operation low production process, short production period and low power consumption.

Description

technical field [0001] The invention relates to a papermaking process, in particular to a new production process for a papermaking dispersant, low molecular weight sodium polyacrylate. Background technique [0002] Low-molecular-weight sodium polyacrylate aqueous solution is widely used as a paper-making coating dispersant. The traditional production process uses a large amount of isopropanol as a chain transfer agent or molecular weight regulator for acrylic acid polymerization, and also as a solvent in the reaction process. 2-4 times the amount; when the reaction is over, distill off excess isopropanol under reduced pressure. It is easy to cause part of the isopropanol to volatilize in the whole production process, and the distillation operation is also difficult to make all the solvents recover. Therefore, the loss of isopropanol increases the production cost and pollutes the environment. In addition, due to a large amount of The presence of isopropanol relatively reduce...

Claims

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Application Information

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IPC IPC(8): C08F120/06D21H21/08
Inventor 陈传平固旭周苏闽张强华
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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