Biomass glycol refining method

A biomass ethylene glycol and refining method technology, applied in the field of biomass ethylene glycol refining, can solve the problems of cumbersome process, high energy consumption, and low adsorption capacity of adsorbents

Inactive Publication Date: 2014-10-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, the UV transmittance of unrefined biomass ethylene glycol at 220nm, 275nm and 350nm is 0.0001%-55%, 0.1%-75%, 30%-90%, respectively, which cannot meet the corresponding requirements
[0006] Patents US 4647705 and CN 101032688A both invented an aluminum-nickel alloy as a catalyst for catalytic hydrogenation of petroleum-based crude ethylene glycol. It was found that through catalytic hydrogenation, the UV transmittance of ethylene glycol reached the polymerization level standard. However, there is still the problem of loss of catalyst
[0007] Patent US 5770777, CN 1580020 A adopts the method of adsorption to improve the light transmittance of crude ethylene glycol. Although the adsorption method can improve the ultraviolet light transmittance of ethylene glycol to the polymerization level, the adsorption capacity of the adsorbent is low, which affects its service life.
[0008] CN 101928201 A uses hydrogenation and adsorption to improve the ultraviolet light transmittance of coal-based crude ethylene glycol. Although ethylene glycol can also reach the polymerization level standard, the process is cumbersome and energy-consuming. low yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Catalytic conversion experiment: put 5g of catalyst into a fixed-bed reactor, in situ reduction with hydrogen at 200-500°C for 1 hour, then lower the temperature to 60-150°C, stabilize for 30 minutes, and then use a high-pressure pump to feed crude biomass ethylene glycol raw materials , mass space velocity WHSV is controlled at 0.1-100h -1 , the hydrogen air velocity GHSV is controlled at 100-10000h -1 . The reacted ethylene glycol was separated by gas and liquid, and then taken out for ultraviolet light transmittance analysis, and the light transmittance at 220nm, 275nm and 350nm was detected.

Embodiment 2

[0024] The refining results of different biomass ethylene glycol (Table 1), the reaction conditions are the same as in Example 1, the catalyst is 2% Ru / AC, and the volume space velocity of crude biomass ethylene glycol is 6h -1 , 90°C, hydrogen pressure is 5MPa, hydrogen volume flow rate is 1000h -1 .

[0025] Raw material A is derived from ethylene glycol obtained by catalytic hydrocracking of sorbitol.

[0026] Raw material B is derived from ethylene glycol obtained by catalytic hydrocracking of glucose.

[0027] Raw material C is derived from ethylene glycol obtained by catalytic hydrocracking of cellulose.

[0028] Table 1 Refining results of crude biomass ethylene glycol from different sources

[0029]

[0030] As shown in Table 1, although the initial light transmittance of biomass ethylene glycol varies greatly, the ultraviolet light transmittance of ethylene glycol after catalytic hydrogenation refining is significantly improved, and the light transmittance meets...

Embodiment 3

[0032] The results of catalytic purification of crude biomass ethylene glycol on different catalysts (Table 2), the reaction conditions are the same as in Example 1.

[0033] Table 2 The purification results of crude ethylene glycol on different catalysts (crude ethylene glycol volume space velocity is 10h -1 , 100℃, hydrogen pressure is 4MPa, hydrogen volume space velocity is 1200h -1 ):

[0034]

[0035] As shown in Table 2, on different catalysts, the UV light transmittance of crude ethylene glycol has been significantly improved, respectively meeting the requirements of polymerization grade.

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Abstract

The invention provides a biomass glycol refining method. According to the method, a glycol crude product obtained by a biomass route is used as a raw material, 8th, 9th and10th group transition metal iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium and platinum are uses as catalyst active components, one step catalytic hydrogenation is performed in a fixed bed reactor at 40-160 DEG C under the hydrogen pressure of 0.2-10MPa to realize efficient refining of the crude glycol, the aldehyde content of the refined glycol product is less than 3ug/ g, and the UV transmittance at 220nm, 275nm and 350nm are respectively more than 75%, 92% and 99%. The crude glycol raw material comes from renewable resources, and has the advantages of being environmental friendly, green and renewable. In addition, the process has the advantages of short reaction time, good catalyst stability, good glycol UV transmittance, high space-time yield and the like, and has potential application prospects.

Description

technical field [0001] The invention relates to a method for refining biomass ethylene glycol, specifically a method for hydrogenating and refining crude ethylene glycol obtained by catalytic conversion of biomass, so that the light transmittance can be obviously improved and reach the polymerization grade standard. Background technique [0002] Ethylene glycol is an important organic chemical raw material. It can be polymerized with diacids to prepare polymers such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), etc. It is also the most important use of ethylene glycol. However, due to the existence of trace impurities in different degrees in ethylene glycol products, it has ultraviolet absorption in the wavelength range of 220-350nm, which affects the product quality of polyester in different degrees, and cannot meet the requirements of polymerization. [0003] At present, the production of ethylene glycol by large chemical companies at home and abroa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/90B01J23/46B01J23/42
CPCY02P20/52C07C29/90B01J23/002B01J23/42B01J23/462B01J23/464B01J23/468B01J2523/00
Inventor 张涛庞纪峰郑明远姜宇王爱琴
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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