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Refining agent and refining method of coal polymer grade glycol

A polymer grade, ethylene glycol technology, which is applied in the field of polymer grade coal-to-ethylene glycol products, can solve the problems of little effect, tedious and complicated, and the decrease of UV value of raw materials.

Active Publication Date: 2015-11-25
HAISO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for coal-to-ethylene glycol, its reaction principle and process route are completely different from those of petroleum routes. Therefore, the traditional methods for improving the UV value of ethylene glycol in petroleum routes are very effective when applied to the refining of coal-to-ethylene glycol. It cannot be raised to the polymerization level standard, and some methods have no effect at all and even reduce the UV value of the raw material. However, most of the existing reported methods for the refining of coal-to-ethylene glycol involve device design and Process transformation, too cumbersome and complicated

Method used

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  • Refining agent and refining method of coal polymer grade glycol
  • Refining agent and refining method of coal polymer grade glycol
  • Refining agent and refining method of coal polymer grade glycol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～9

[0031] A variety of commercially available conventional adsorbents were screened for static adsorption treatment of industrial grade coal-to-ethylene glycol. The adsorbent is directly ground into powder without any pretreatment. Static adsorption solid-to-liquid ratio = 1:200, stirring and reacting at 30°C for 4 hours, then use a sand core funnel to filter and measure the UV value of the filtrate, the results are shown in Table 1

[0032] Table 1

[0033]

[0034]

[0035] The results of static adsorption experiments on industrial-grade coal-to-ethylene glycol with nine kinds of adsorbents without any pretreatment in Table 1 show that activated carbon can improve the UV value of raw materials, but the improvement is very limited and cannot reach the polymerization level index. Other adsorbents, such as silica gel, molecular sieve, clay, etc., not only cannot improve the UV value of the raw material, but will reduce it.

Embodiment 10～15

[0037] Collect activated carbon from different manufacturers to perform fixed-bed dynamic adsorption treatment on industrial grade coal-to-ethylene glycol, LHSV=4h -1 , The adsorption temperature is 20-40°C. Activated carbon has not been pretreated, and the UV values ​​of each band of ethylene glycol after treatment are shown in Table 2:

[0038] Table 2

[0039]

[0040] It can be seen from Table 2 that most of the above 6 different types of activated carbon can improve the UV value of coal-to-ethylene glycol to varying degrees, but the improvement is limited and still cannot meet the requirements of polymerization grade, so it is difficult for unmodified activated carbon to meet the requirements. Coal-to-ethylene glycol refining is required to obtain polymer-grade standard ethylene glycol.

Embodiment 16～20

[0042] Select the shell carbon 01 used in Example 10 in the above table, grind it to 20-40 mesh, and pretreat it with different solvents after sieving. Then, 12ml of activated carbon pretreated by different solvents were filled in the quartz tubes of φ10×800mm respectively, and the industrial-grade coal-to-ethylene glycol was subjected to fixed-bed adsorption treatment. Wherein the acid solution used for pretreatment in Example 17 is 15% hydrochloric acid aqueous solution, and the mixed solvent used in Example 20 is the mixed solution of hydrochloric acid, methyl alcohol, water, and wherein, the mass percentage concentration of methyl alcohol and hydrochloric acid is respectively 35% and 15% . The pretreatment method is as follows: soak the activated carbon in the pretreatment solution (the volume of the solution is 2 to 3 times the volume of the activated carbon), stir and impregnate at 50°C for 2 hours, wash it with deionized water, and dry it in an oven at 140°C. LHSV=4h d...

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Abstract

The invention provides a refining agent and a refining and purifying method of coal polymer grade glycol. The refining agent of coal polymer grade glycol is characterized by being activated carbon modified by acid etching pretreatment, wherein an acid solution used by pretreatment is a ternary mixed solution of inorganic acid, low carbon alcohol and water. The refining method of coal polymer grade glycol is characterized in that coal glycol sequentially passes through fixed bed layers filled with the refining agent, an over-entering and down-out sampling way is adopted, the refining temperature is 10-100 DEG C, and the liquid hourly space velocity is 0.5-8 / h. The UV value of coal glycol refined by the method can reach the polymer grade standard (220nm>=75%, 275nm>=92%, 350nm>=99%). Compared with the prior art, the refining method provided by the invention has the advantages of simple process flow, high adsorption capacity and simple regeneration method. Verified by pilot plant tests of 300 tons of coal glycol per year, the effect is good.

Description

technical field [0001] The present invention relates to a refining preparation and refining method of coal-based polymer-grade ethylene glycol, in particular to making industrial-grade coal-based ethylene glycol pass through the refining agent bed to remove its content which is very small but has a great impact on product quality. In particular, impurities that have a greater impact on the UV transmittance increase the UV transmittance of the product and obtain a polymer grade coal-to-ethylene glycol product. Background technique [0002] Ethylene glycol is an important bulk basic chemical raw material and the most consumed polyol in the world. It is mainly used in the production of polyester fiber, antifreeze, unsaturated polyester resin, lubricant, plasticizer, non-ionic surface Active agents and explosives, etc. In addition, it can also be used in coatings, photographic developers, brake fluids, inks and other industries, as well as the production of special solvents such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/76C07C31/20
CPCC07C29/76C07C31/202
Inventor 孔渝华吕明肖二飞钱胜涛胡勇军刘华伟刘应杰雷军王先厚胡典明
Owner HAISO TECH
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