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

Inactive Publication Date: 2018-06-01
SINOPEC SSC +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Initially, pregelatinized or expanded starch was used in drilling fluid, but when used, the drilling fluid will 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

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Sulfoalkyl starch, preparation method and application thereof
  • Sulfoalkyl starch, preparation method and application thereof
  • Sulfoalkyl starch, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] The present invention provides a preparation method of sulfoalkylated starch, which comprises the following steps:

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

[0028] The invention synthesizes a starch derivative with a sulfonic acid group that is not sensitive 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 to the aqueous solvent system according to a certain amount ratio of the substances to carry out the reaction. In the present invention, starch is preferably added to the aqueous solvent first, then the alkaline substance is added, and the water-soluble ethanesulfonate is added for reaction after st...

Example Embodiment

[0044] Example 1

[0045] According to the ratio of starch: sodium hydroxide: sodium 2-bromoethanesulfonate: benzyltriethylammonium chloride = 1:0.905:0.505:0.025, 100g starch was added to the ethanol-water system (alcohol: water Volume ratio=7:3), then add 50% sodium hydroxide aqueous solution, stir at room temperature for 0.5h; add formula amount of sodium 2-bromoethanesulfonate and benzyl triethyl chloride Ammonium, heated to 35°C with stirring, and reacted at 35°C for 10 hours to obtain a reaction liquid; neutralized with hydrochloric acid to a pH of 7 to 8.5, then centrifuged the reactant, and the solvent was distilled to recover and reuse the product. ~3 times methanol washing, centrifugal separation, methanol is distilled to recover and reuse; the obtained product is dried and crushed to obtain 106.5g product.

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

Example Embodiment

[0047] Example 2

[0048] According to the ratio of starch: sodium hydroxide: sodium 2-bromoethanesulfonate: benzyl triethylammonium chloride = 1:1.2:1.05:0.05, 100g starch was added to the ethanol-water system (alcohol: water The volume ratio = 6: 4), then add 50% mass fraction of sodium hydroxide aqueous solution, stir at room temperature for 4h; add formula amount of sodium 2-bromoethanesulfonate and benzyl triethylammonium chloride After stirring, the temperature was raised to 70°C and reacted at 70°C for 1 hour to obtain a reaction liquid; neutralized with hydrochloric acid to a pH of 7 to 8.5, and then centrifuged the reactants. The solvent was distilled to recover and reuse the product. The methanol was washed three times, centrifuged, and the methanol was recovered and reused through distillation; the obtained product was dried and pulverized to obtain 107.1 g of product.

[0049] The product was tested according to the method described above, and the DS of the obtained pr...

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
Viscosityaaaaaaaaaa
Density ρaaaaaaaaaa
Viscosityaaaaaaaaaa
Login to view more

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.

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...

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
IPC IPC(8): C08B31/12C09K8/20
CPCC08B31/12C09K8/206
Inventor 王中华
Owner SINOPEC SSC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap