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Purification technique for coal glycol rude products

A coal-to-ethylene glycol and crude product technology, applied in the chemical industry, can solve the problems of not effectively reducing the content of aldehydes and ketones, and achieve the effects of high catalyst utilization, energy saving, and easy operation

Active Publication Date: 2010-12-29
SHANGHAI HUAYI ENERGY CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method cannot effectively reduce the content of aldehydes and ketones

Method used

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  • Purification technique for coal glycol rude products
  • Purification technique for coal glycol rude products
  • Purification technique for coal glycol rude products

Examples

Experimental program
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Effect test

Embodiment 1

[0047] In this embodiment, the coal-based ethylene glycol crude product (1) with a mass percentage of ethylene glycol of 20% is mixed with sodium hydroxide solution (2) and enters the saponification reactor B1. In the sodium hydroxide solution, the mass percent concentration of the solute is 1%, the reaction temperature is 60° C., the reaction pressure is 0.1 MPa, and the mass ratio of sodium hydroxide to ethylene glycol is 1%. The reactor is a tubular reactor, and the single tube is φ25×20000. The saponification reaction product enters the methanol recovery tower (B2).

[0048] The methanol recovery tower (B2) has a diameter of 378mm, 40 trays in total, and is operated under normal pressure. The liquid feed position is between 25 trays, R=3, the liquid feed temperature is 40°C, and the tower top temperature is 61.5 °C, the temperature of the tower kettle is 118.3 °C, and the reflux temperature is 55 °C. Methanol (4) is discharged from the top of the methanol recovery tower (...

Embodiment 2

[0060] Liquid-phase hydrogenation uses a commercial Ranney Ni catalyst, the hydrogenation reaction temperature is 120°C, the reaction pressure is 3.0MPa, and the space velocity is 5h -1 , other conditions are as embodiment 1.

[0061] The ultraviolet transmittance of main logistics in the present embodiment is shown in the table below:

[0062] Table 2 UV value of main logistics

[0063]

Embodiment 3

[0065] The resin adsorption tower is made of commercial macroporous adsorption resin, the temperature is 50°C, the pressure is normal pressure or slightly positive pressure, and the space velocity is 2h -1 , other conditions are as embodiment 1.

[0066] The ultraviolet transmittance of main logistics in the present embodiment is shown in the table below:

[0067] Table 3 UV value of main logistics

[0068]

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Abstract

The invention belongs to the technical field of chemical industry, in particular to a purification technique for coal glycol rude products. According to the technique, saponification, carbinol-removal, hydrogenation reaction, three-column distillation and absorption treatment are utilized to prepare the glycol with a mass percent more than 99.9% from the coal glycol rude products and the polyester glycol products having high transmissivity to the ultraviolet with wavelength between 220 and 350 mm. The purification technique for coal glycol rude products of the invention is characterized by low energy consumption, easy operation and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a purification process of a crude product of ethylene glycol produced from coal. Background technique [0002] Ethylene glycol is an important organic chemical raw material, which can react with terephthalic acid (PTA) to produce polyethylene terephthalate (PET, or PET), which can be used as a raw material for polyester fibers and polyester plastics. Polyester resin), which is currently the most important use of ethylene glycol, but only ethylene glycol with higher purity can be used to manufacture polyester resins, so the purity of the synthetic ethylene glycol crude product should be tested. The crude ethylene glycol product whose purity cannot meet the requirements needs to be purified before it can be applied to the preparation of polyethylene terephthalate. [0003] The impurities in the crude ethylene glycol product will greatly affect the ultraviolet...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/88C07C29/80C07C29/74C07C31/04
Inventor 徐长青黄斌鲁文质吴良泉
Owner SHANGHAI HUAYI ENERGY CHEM
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