Method for producing ethylene glycol by catalysis rectification

A technology of catalytic rectification and catalytic rectification column is applied in the field of catalytic rectification to produce ethylene glycol, which can solve the problems of long process flow, large energy consumption, large equipment investment and the like, and achieve the effect of simplifying the process.

Inactive Publication Date: 2008-02-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to overcome the high water ratio of non-catalytic hydration reaction existing in the prior art, long process flow, high energy consumption, or the reactor of the catalytic hydration process is huge, the investment in equipment is large, and the stability requirements of the catalyst are high. High, resulting in high production costs, and the use of catalytic distillation process, the problem of low yield of ethylene glycol, to provide a new method of catalytic distillation to produce ethylene glycol

Method used

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  • Method for producing ethylene glycol by catalysis rectification

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Experimental program
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Effect test

Embodiment 1

[0026] The preparation method of solid niobic acid catalyst is: take by weighing 10 grams of commercially available niobium oxalate and dissolve it in 40 milliliters of water to make niobium oxalate solution; weigh 1.0 gram of Zn(NO 3 ) 2 ·6H 2 O was dissolved in 5 ml of 10% dilute nitric acid aqueous solution to make zinc nitrate solution. Weigh α-Al 2 o 3 80 g, ZrO 2 Add 20 grams into the kneader, then add the niobium oxalate and zinc nitrate solution prepared above, and mix with α-Al 2 o 3 Fully kneaded to form a lump material, extruded into rods, dried in vacuum at 120°C for 2 hours, and calcined in air at 500°C for 4 hours to obtain solid niobic acid catalyst A. The catalyst composition is shown in Table 1.

Embodiment 2

[0028] Prepare solid niobic acid catalyst B by the method of embodiment 1, the difference is that niobium oxalate consumption is 2.4 grams, 0.18 gram Zn(NO 3 ) 2 ·6H 2 O dissolved in 20 ml water, SiO 2 / Al 2 o 3 100 grams of HZSM-5 molecular sieve carrier with a molar ratio of 140 was dried in vacuum at 110° C. for 2 hours, and calcined in air at 300° C. for 4 hours. The catalyst composition is shown in Table 1.

Embodiment 3

[0030] Prepare solid niobic acid catalyst C by the method of embodiment 1, the difference is that niobium oxalate consumption is 2.4 grams, 18 gram Zn(NO 3 ) 2 ·6H 2 O dissolved in 20 ml of water, 5 g of inorganic clay binder, 20 g of α-Al carrier 2 o 3 and SiO 2 / Al 2 o 3 80 grams of HZSM-5 molecular sieve with a molar ratio of 140, dried in vacuum at 120°C for 2 hours, and calcined in air at 700°C for 4 hours. The catalyst composition is shown in Table 1.

[0031] Table 1

[0032] Example

[0033] Other acidic or alkaline insoluble water-soluble inorganic materials and their composite materials can also improve the selectivity of ethylene glycol by adopting the catalytic rectification method of the present invention, and the specific preparation method of the catalyst provided here is not to limit the present invention range.

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Abstract

The present invention relates to a method for producing ethylene alcohol by a catalyzing and distilling method, which is to solve the problems in the existing technology that: the existing method needs multi towers or multi reaction devices and steps to realize the reaction and separation; besides the benefit ratio for non-phase catalyzing single ethylene alcohol is much lower. The present invention adopts water and ethylene oxide as the material, and takes the reaction and separation operations in a catalyzing and distilling tower; so the two processes including the hydration reaction for ethylene oxide and the separation reaction for the ethylene alcohol. The catalyzer used in the present invention adopts an acidic or alkaline organic material or inorganic material or the composite material; the method can solve the problem greatly, which can be uses in the industrial production of ethylene alcohol.

Description

technical field [0001] The invention relates to a method for producing ethylene glycol by catalytic rectification. Background technique [0002] Ethylene glycol is mainly used in the production of polyester resins, including fibers, films and engineering plastics. It can be directly used as coolants and antifreezes. It is also used in the production of alkyd resins, plasticizers, paints, adhesives, surfactants, and explosives. It is an essential substance for products such as capacitor electrolyte and capacitor electrolyte, and is a very important aliphatic diol. [0003] There are two main processes for preparing ethylene glycol from ethylene oxide: one is the direct hydration method, in which ethylene oxide and water react under certain conditions to form ethylene glycol, which is divided into catalytic hydration and non-catalytic hydration Two processes; the other is the ethylene carbonate method, that is, under the action of a catalyst, ethylene oxide first reacts with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/10B01J23/20
CPCY02P20/52
Inventor 何文军李应成费泰康王嘉华陈永福
Owner CHINA PETROLEUM & CHEM CORP
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