High-temperature-resistant filtrate reducer and preparation method thereof

Abstract

The invention discloses a high-temperature-resistant filtrate reducer and a preparation method thereof. The high-temperature-resistant filtrate reducer is composed of, by weight, 2.5-11.5 parts of lignin, 1-4 parts of acrylamide, 0.5-1.5 parts of p-methylphenol and 1-6 parts of 2-acrylamido-2-methylpropane sulfonic acid. The method includes the first step of filtering papermaking black liquid to extract lignin, the second step of establishing a water-phase solution with reactive monomers, the third step of establishing a reaction monomer microemulsion solution, and the fourth step of adding other reaction elements to prepare the high-temperature-resistant filtrate reducer finished product. The high-temperature-resistant filtrate reducer and the preparation method have the advantages that the temperature resistance of the filtrate reducer is improved, and the filtrate reducer is suitable for being industrially applied and popularized.

Description

technical field [0001] The invention relates to a fluid loss reducer and a preparation method thereof, in particular to a high temperature resistant fluid loss reducer and a preparation method thereof. Background technique [0002] At present, the papermaking industry widely adopts the alkaline pulping and papermaking process (including caustic soda method and sulfate method). No matter woody or herbaceous plants are used as raw materials, dark brown wastewater will be produced during the alkaline cooking process, which is called papermaking black liquor. . Papermaking black liquor is rich in organic matter such as lignin, cellulose and hemicellulose, and also contains pigments and inorganic salts. If the untreated papermaking black liquor is directly discharged into the water body, it will make the water body black and smelly, consume a large amount of dissolved oxygen in the water, and seriously damage the ecological balance. Caustic soda recovery technology is currently...

AI Technical Summary

Problems solved by technology

If the untreated papermaking black liquor is directly discharged into the water body, it will make the water body black and smelly, consume a large amount of dissolved oxygen in the water, and seriously damage the ecological balance

Caustic soda recovery technology is currently the main treatment method for papermaking black liquor. It uses lignin in black liquor as fuel and recovers alkali from the solids after combustion. However, this treatment method completely eliminates the lignin in papermaking black liquor. Utilization, and it needs to consume a lot of water, there are also problems of scaling the evaporator, low recovery rate and high cost

[0003] At present, most of the reports on the use of lignin to prepare fluid loss control agents for oilfield drilling fluids use the condensation of formaldehyde and lignin to obtain fluid loss control products with similar functions to phenolic resins, but the lignin involved in the preparation method The purity is high, which increases the cost, and formaldehyde is easy to pollute the environment, and the reaction speed is difficult to control

In April 2012, Wang Pingquan and others reported that acrylamide and 2-propylene Acyloxy-2-methylpropyl sulfonic acid is a reaction monomer and calcium lignosulfonate graft copolymerized to generate high-temperature fluid loss reducer and its preparation method, but the calcium lignosulfonate used in the method is Lignin deep-processing products have high preparation costs, and the free radical polymerization method used will cause low conversion rate of reaction monomers and wide relative molecular mass distribution of products, which will affect the performance of fluid loss control agents.

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