Super high molecular weight polyacrylamide industrialized production process

A polyacrylamide and ultra-high molecular weight technology is applied in the field of industrialized production technology, which can solve the problems of high salinity of formation water, inability to treat sewage, and inability to meet the tertiary oil recovery technology in oil fields, and achieve the effect of overcoming high reaction temperature.

Inactive Publication Date: 2006-11-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the further promotion of this technology faces many difficulties: more and more formation water has high salinity, and at the same time, the sewage produced by polymer flooding cannot be treated, and environmental protection problems are becoming increasingly prominent
According to the research, the problem of sewage complexation can be solved only when the molecular weight of polyacrylamide reaches more than 25 million, while the existing industrialized products of polyacrylamide with a molecular weight of less than 25 million cannot meet the needs of tertiary oil recovery technology in oilfields

Method used

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  • Super high molecular weight polyacrylamide industrialized production process
  • Super high molecular weight polyacrylamide industrialized production process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Equipment and materials

[0030] Dissolving tank (12 tons / pot); reactor (6 tons / pot); columnar material box; feeding pump; twin-screw granulator; feeding fan; hydrolysis machine (4 tons / pot); dryer; grinder ; sifter. 25% Acrylamide; Ethylene Glycol Dimethacrylate; Initiator; Potassium Hydroxide; Nitrogen; Desalted Water.

[0031] 2. Operation steps, see figure 2

[0032] 1) The reaction scale is 6 tons. In the dissolution tank (8), 23% acrylamide aqueous solution is prepared with 25% acrylamide and desalted water, and 4% ethylene glycol dimethacrylate is added, and the temperature is adjusted to 5°C. The pH value is adjusted to 7.5-9.0.

[0033] 2) After the reaction mother liquor is prepared, transfer it to the reactor (10) by the dissolving pump (9), blow nitrogen for 1 hour, add a complex initiator to initiate the reaction, and react for about 6 hours.

[0034] a trigger system

Potassium persulfate 0.1%

Sodium sulfite 0.1

two-stage in...

Embodiment 2

[0041]The reaction scale is 12 tons: the concentration of acrylamide is 26%, the functional monomer ethylene glycol dimethacrylate is 6%, and the polymerization is initiated by an initiator. The reaction period is 4-7h, and the hydrolysis degree is 28%. 80°C, hydrolysis reaction time 1-5h, after drying, crushing, sieving to obtain ultra-high molecular weight polyacrylamide products with a molecular weight of more than 25 million.

[0042] 1. Equipment and materials

[0043] Dissolving tank (24 tons / pot); Reactor (12 tons / pot); Conveying pump; Rotary knife-sieve plate granulator; Conveying fan; Horizontal hydrolysis machine (8 tons / pot); Dryer; Grinding machine; sifter. 28% acrylamide; initiator; sodium hydroxide; nitrogen; desalinated water.

[0044] 2. Operation steps (see figure 1 )

[0045] 1) The reaction scale is 12 tons. In a dissolving tank, use 50% acrylamide aqueous solution, ethylene glycol dimethacrylate and desalted water to prepare a prepolymer liquid by 26% a...

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Abstract

The invention discloses an industrial manufacturing technology of polyacrylamide (over 25,000 thousand molecular weights), which is characterized by the following: introducing functional monomer under insulation condition; finishing polymerization reaction through synergic action of three-segmented composite initiator; grinding; graining; hydrolyzing; drying; breaking; screening; improving polymerization molecular weight to polymerize block kettle-typed polyacrylamide; fitting for large scale producing; making the product quality, volume of production, energy consumption and using scope satisfy domestic leading level.

Description

technical field [0001] The invention relates to an industrial production process for synthesizing polyacrylamide with ultra-high molecular weight (molecular weight over 25 million), which is suitable for large-block still-type polymerization of polyacrylamide in industrial production. Background technique: [0002] At present, the production technology of polyacrylamide at home and abroad mainly includes: pre-adding alkali homopolymerization and co-hydrolysis process, acrylamide and acrylic acid copolymerization process, and post-polymerization hydrolysis process. Foreign polyacrylamide manufacturers mainly include French SNF company and Ciba company, all of which adopt acrylic acid-acrylamide copolymerization technology to produce polyacrylamide, and the molecular weight of industrial products is within 22 million. In China, pre-alkali co-hydrolysis process is widely used in China, and the molecular weight of industrialized products is within 22 million. In actual producti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/56C08F2/00
Inventor 周云霞
Owner PETROCHINA CO LTD
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