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Method for recycling sodium formate products from coarse sodium formate of byproduct of polyhydric alcohol

A crude sodium formate and polyol technology, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of crude sodium formate easy to absorb moisture and agglomerate, high moisture and organic content, inconvenient on-site application, etc., to achieve cost The effect of low cost, good quality and simple process

Inactive Publication Date: 2013-01-30
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its inherent properties, coupled with high moisture and organic content, crude sodium formate is easy to absorb moisture and agglomerate, which is not convenient for on-site application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 320 parts by mass of neopentyl glycol by-product crude sodium formate, 32 parts by mass of powdered activated carbon activated carbon, and 320 parts by mass of water were added to a stirred reaction kettle, and the temperature in the kettle was raised to 95° C. while stirring for 0.5 h. Centrifuge while hot to obtain decolorized crude sodium formate. The decolorized crude sodium formate is flaky crystals with strong odor. The content of neopentyl glycol in the water filtrate was 1.69% analyzed by GC-MS.

[0026] Add the decolorized crude sodium formate in the previous step into the pressure-resistant reaction kettle, add 320 parts by mass of 95% (mass / mass percentage) butanol aqueous solution, and raise the temperature in the kettle to 140°C. At this time, the pressure in the kettle is 0.2-0.3 MPa, and the process is stirred. After 1 hour, it was cooled to normal pressure and centrifuged to obtain a sodium formate product with a changed crystal form. The content of sodiu...

Embodiment 2

[0028] 320 parts by mass of neopentyl glycol by-product crude sodium formate, 12.8 parts by mass of activated carbon from the husk, and 200 parts by mass of water were added to a stirred reaction kettle, and the temperature in the kettle was raised to 95° C. while stirring for 0.5 h. Centrifuge while hot to obtain decolorized crude sodium formate. The decolorized crude sodium formate is flaky crystals with strong odor. The content of neopentyl glycol in the water filtrate was 1.88% analyzed by GC-MS.

[0029] Add the decolorized crude sodium formate in the previous step to the pressure-resistant reaction kettle, add 320 parts by mass of 95% (mass / mass percentage) ethanol aqueous solution, and raise the temperature in the kettle to 120°C. At this time, the pressure in the kettle is 0.3-0.4 MPa, and agitating treatment 1 After hours, it was cooled to normal pressure and centrifuged to obtain a sodium formate product with a changed crystal form. The content of sodium formate is 95...

Embodiment 3

[0031] 320 parts by mass of neopentyl glycol by-product crude sodium formate, 16 parts by mass of coal-based columnar activated carbon, and 320 parts by mass of water were added to a stirred reaction kettle, and the temperature in the kettle was raised to 95° C. while stirring for 1.0 h. Centrifuge while hot to obtain decolorized crude sodium formate. The decolorized crude sodium formate is flaky crystals with strong odor. The content of neopentyl glycol in the water filtrate was 1.90% analyzed by GC-MS.

[0032] Add the decolorized crude sodium formate in the previous step into the pressure-resistant reaction kettle, add 160 parts by mass of 98% (mass / mass percentage) ethanol aqueous solution, and raise the temperature in the kettle to 120°C. At this time, the pressure in the kettle is 0.3-0.4MPa, and the stirring treatment is 1.5 After hours, it was cooled to normal pressure and centrifuged to obtain a sodium formate product with a changed crystal form. The content of sodium ...

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PUM

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Abstract

The invention discloses a method for recycling sodium formate from coarse sodium formate of a byproduct of polyhydric alcohol and changing the crystal form of the sodium formate to produce a sodium formate product with high quality and free flow. The method comprises the following steps of: adding the coarse sodium formate of the byproduct of the polyhydric alcohol, water and active carbon in a reaction kettle, heating the mixture, stirring the mixture, decoloring the mixture and filtering a hot resulting product to obtain the sheet-shaped decolored coarse sodium formate; and adding the decolored coarse sodium formate in a pressure proof reaction kettle, adding aqueous solution of low-carbon chain alcohol, heating the mixture until the temperature of the mixture is above the boiling point of the low-carbon chain alcohol, performing the changing crystal form treatment by pressurization, cooling the mixture to the normal pressure, and separating and air drying or drying the mixture to obtain the sodium formate product with high quality, fine particle shape and free flow. The method has the advantages of simple process, low investment, and low cost, and by the method, the sodium formate product with high quality, fine particle shape and free flow can be obtained. The sodium formate product can be used for producing high-quality formic acid or conveniently used for water-based drilling and well completion fluid in the oil-gas industry.

Description

Technical field [0001] The invention relates to a method for recovering high-quality free-flowing sodium formate products from crude sodium formate by-product of polyols. Furthermore, it is a method of recovering sodium formate from crude sodium formate by-product of polyhydric alcohol and changing the crystal form of sodium formate. Background technique [0002] With the rapid development of my country's polyol industry, the amount of by-product crude sodium formate from neopentyl glycol, pentaerythritol and trimethylolpropane has exceeded 80,000 tons. Neopentyl glycol is the raw material for the production of saturated polyester resins, powder coatings, photosensitive crosslinkers, and alkyd resins. Industrially, formaldehyde and isobutyraldehyde are used for condensation reaction in the presence of sodium hydroxide (or calcium hydroxide) to generate neopentyl glycol. After separation, neopentyl glycol is obtained. At the same time, it discharges a large amount of sodium forma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/06C07C51/42C07C51/43
Inventor 夏小春李俊秀莫成孝王同友罗健生
Owner CHINA NAT OFFSHORE OIL CORP