Sulfoalkyl starch, preparation method and application thereof

A technology of sulfoalkylated starch, which is applied in the field of sulfoalkylated starch, and its preparation can solve the problems of drilling fluid foaming, insufficient anti-calcium ability, and limited application range, etc., and achieve improved thermal stability and stable product quality , Improve the effect of anti-salt pollution

CN108101999AInactive Publication Date: 2018-06-01SINOPEC SSC +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2018-06-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the technical field of starch modification, and provides sulfoalkyl starch, as well as a preparation method and an application thereof. The method comprises the following steps: under an alkaline condition, starch and water-soluble halogenated ethylsulfonate are reacted in an aqueous solvent, in order to obtain sulfoalkyl starch; the sulfoalkyl starch contains an ethylsulfonate groups and hydroxyl groups. The sulfoalkyl starch is used for drilling fluid, in order to effectively control filter loss of drilling fluid, improve salt pollution resistance of the drilling fluid at the same time, and especially the capability for resisting calcium ion pollution. At the same time, sulfonic groups are good for improving heat stability of the drilling fluid, and enlarging application ranges. The production process is simple, production cost is low, production efficiency is high, product quality is stable, and the method is good for applications.
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Description

technical field

[0001] The invention relates to the technical field of starch modification, in particular to a sulfoalkylated starch, its preparation method and application. Background technique

[0002] In recent years, starch modified products have become important drilling fluid treatment agents due to their abundant sources, greenness and low price. Initially, pregelatinized or expanded starch was used in drilling fluids, but when used, the drilling fluid would foam due to fermentation, making the effect worse. Moreover, when the temperature exceeds 100°C, it will even fail due to the complete degradation of starch.

[0003] In the 1980s, carboxymethyl starch (CMS) was developed and applied, and the temperature resistance has been improved to a certain extent; and the graft copolymerization of starch and ethylenic monomers can further improve the temperature resistance, but the cost increases. Starch modified products represented by CMS are recognized as ideal fluid lo...

Examples

preparation example Construction

[0026] The invention provides a method for preparing sulfoalkylated starch, comprising the following steps:

[0027] Under alkaline conditions, starch and water-soluble haloethanesulfonate are reacted in an aqueous solvent to obtain sulfoalkylated starch.

[0028] The present invention synthesizes starch derivatives with sulfonic acid groups that are insensitive to high-valent metal ions, that is, prepares sulfoalkylated starch, which has strong temperature resistance and calcium resistance, and can expand the application range of starch treatment agents .

[0029] In the embodiment of the present invention, starch, alkaline substances and water-soluble ethanesulfonate are added into the aqueous solvent system according to a certain ratio of substances to carry out the reaction. In the present invention, it is preferred to firstly add starch into the aqueous solvent, then add alkaline substances, and then add water-soluble ethanesulfonate for reaction after stirring.

[0030...

Embodiment 1

[0045] According to the ratio of starch: sodium hydroxide: sodium 2-bromoethanesulfonate: benzyltriethylammonium chloride = 1:0.905:0.505:0.025, 100g starch is added to the ethanol-water system (alcohol: water volume ratio=7:3), then adding mass fraction of 50% sodium hydroxide aqueous solution, stirred at room temperature for 0.5h; ammonium, heated to 35°C with stirring, and reacted at 35°C for 10 hours to obtain a reaction solution; neutralized with hydrochloric acid to a pH value of 7 to 8.5, then centrifuged the reactant, recovered the solvent by distillation, and used 1 ~3 times of washing with methanol, centrifugation, and recovery of methanol through distillation; the obtained product was dried and pulverized to obtain 106.5 g of product.

[0046] The product was detected according to the method described above, and the DS of the obtained product was 0.15; the viscosity of 1% aqueous solution was 70 mPa.s.

Embodiment 2

[0048] According to the ratio of starch: sodium hydroxide: sodium 2-bromoethanesulfonate: benzyltriethylammonium chloride = 1:1.2:1.05:0.05, 100g starch is added to the ethanol-water system (alcohol: water volume ratio=6:4), then adding mass fraction is 50% aqueous sodium hydroxide solution, stirred at room temperature for 4h; adding 2-sodium bromoethanesulfonate and benzyltriethylammonium chloride in formula quantity , heated to 70°C with stirring, and reacted at 70°C for 1 hour to obtain a reaction solution; neutralized with hydrochloric acid to a pH value of 7 to 8.5, then centrifuged the reactant, and recovered the solvent for reuse after distillation. Wash 3 times with methanol, centrifuge, and recycle the methanol through distillation; the product obtained is dried and pulverized to obtain 107.1 g of the product.

[0049] The product was detected according to the method described above, and the DS of the obtained product was 0.41; the viscosity of 1% aqueous solution was...