Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method of polyacrylic acid and its salt

A technology of polyacrylic acid and acrylic acid, which is applied in the field of fine chemicals, can solve the problems of increased production cost, large amount of initiator, salting out, etc., and achieve the effects of reducing the molecular weight of polymers, increasing the effective use rate, and reducing the amount of initiator

Active Publication Date: 2022-01-04
SHANDONG TAIHE WATER TREATMENT TECH CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method also has certain defects. The use efficiency of initiator persulfate is not high, especially when synthesizing low molecular weight polyacrylic acid, the amount of initiator is large, which not only causes the increase of production cost, but also affects the product quality, and salting out may occur in the later stage Phenomenon

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step 1: Add 50g of pure water, 6.4g of sulfur powder and 1.5g of carbon disulfide into a four-neck round bottom flask, turn on the stirring and reflux cooling device, raise the temperature to 92±2°C, and start to drop 47.6g of over Sodium sulfate aqueous solution, after 0.2h of dropwise addition, began to dropwise add 206g of acrylic acid aqueous solution at a flow rate of 103g / h, the reaction liquid in the reaction kettle remained in a reflux state during the dropwise addition process, and all the dropwise addition was completed after 2.5h.

[0020] Step 2: After the dropwise addition, the reactor continued to react under reflux for 1 hour, lowered the temperature to below 50°C, separated the unreacted sulfur powder by suction filtration, and then added 50g of pure water to dilute to obtain 354.7g of polyacrylic acid aqueous solution with a mass fraction of 40.88%. .

[0021] After testing, the content of inorganic sulfur (SO 4 2- Calculated): 0.021%; Molecular weigh...

Embodiment 2

[0023] Step 1: Add 50g of pure water, 6.4g of sulfur powder and 1.5g of carbon disulfide into a four-neck round bottom flask, turn on the stirring and reflux cooling device, raise the temperature to 92±2°C, and start to drop 47.6g of over Sodium sulfate aqueous solution, after 0.2h of dropwise addition, began to dropwise add 206g of acrylic acid aqueous solution at a flow rate of 103g / h, the reaction liquid in the reaction kettle remained in a reflux state during the dropwise addition process, and all the dropwise addition was completed after 2.5h.

[0024] Step 2: After the dropwise addition, the reactor continued to react under reflux for 1 hour, lowered the temperature to below 50°C, separated the unreacted sulfur powder by suction filtration, added 80% sodium hydroxide for neutralization, and cooled and controlled the temperature < 50°C during the neutralization process , and then add 80g of pure water to dilute to obtain 463.2g of sodium polyacrylate aqueous solution with ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
molecular weight distributionaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for synthesizing polyacrylic acid (sodium). In an aqueous solution, acrylic acid monomers are polymerized by using persulfate as an initiator and an oxidizing agent, and elemental sulfur as a reducing agent and a chain transfer agent. The present invention uses elemental sulfur as a reducing agent and a chain transfer agent to form a redox initiation system with persulfate, and react slowly under the dissolution of carbon disulfide, which greatly improves the effective use rate of initiator persulfate and reduces the The amount of initiator required also reduces the content of inorganic salts in the product; the S of elemental sulfur 8 The sulfur free radicals formed by the structure also play the role of chain transfer, effectively reducing the molecular weight of the polymer; excess sulfur can be separated and reused, the whole reaction process is simple and no three wastes are generated, and it is green and environmentally friendly.

Description

technical field [0001] The patent of the present invention relates to the technical field of fine chemicals, in particular to a synthesis method of polyacrylic acid (sodium). Background technique [0002] Polyacrylic acid (sodium) [PAA (S)] is widely used as a dispersant for petroleum and mining industries, as a synthetic detergent dispersant, and as a formula for use in power plants, chemical plants, fertilizer plants, oil refineries and other water treatment agents. Scale inhibitor and dispersant in circulating cooling water systems such as air conditioning systems. At the same time, as a dispersant, PAA(S) can act on amorphous substances such as soil and corrosion products. This product can also be compounded with a corrosion inhibitor as a compound water stabilizer to enhance the corrosion inhibition effect. Polyacrylic acid (sodium) is widely used, and products with different molecular weights are used in various fields. [0003] Polyacrylic acid (sodium) [PAA (S)] i...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/06C08F4/40C08F2/38
CPCC08F120/06C08F4/40C08F2/38
Inventor 陆久田程终发林胜涛
Owner SHANDONG TAIHE WATER TREATMENT TECH CO LTD