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Method for preparing ethanol through low carbon ester hydrogenation

A low-carbon ester and hydrogen preparation technology, applied in the field of catalytic chemistry, can solve the problems of difficult control, difficult industrial production, uneven temperature distribution of catalyst beds, etc., to improve selectivity, prolong catalyst life, improve raw material conversion rate and catalyst effect of life

Active Publication Date: 2014-07-02
YANCHANG ZHONGKE (DALIAN) ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of industrialization of the above reactors, the temperature distribution of the catalyst bed is uneven and difficult to control, making it difficult to carry out large-scale industrial production

Method used

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  • Method for preparing ethanol through low carbon ester hydrogenation
  • Method for preparing ethanol through low carbon ester hydrogenation
  • Method for preparing ethanol through low carbon ester hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation and molding of embodiment 1 catalyst

[0033] The preparation steps of the Cu-Zn-Al-O catalyst of the present invention are as follows: the nitrate mixed solution of copper nitrate hexahydrate, zinc nitrate hexahydrate, and aluminum nitrate nonahydrate is vigorously stirred at room temperature, and the precipitating agent Na 2 CO 3 The solution was slowly dropped into it, and the co-precipitation reaction was carried out at a constant pH value to 9.0 and a constant stirring speed. After continuing to stir for 150 min, the precipitate was aged overnight. The precipitate was washed with deionized water until neutral, and centrifuged. The obtained precipitate was dried in an oven at 120°C for 24 hours. After drying, the sample was placed in a muffle furnace, and the temperature was raised to 350°C at a heating rate of 2°C / min, and roasted for 2 hours to obtain a roasted sample, which was granulated, crushed, and screened for 10~ 20 mesh spare. The copper-ba...

Embodiment 2

[0036] Embodiment 2. Catalyst pretreatment and reaction

[0037] When starting to investigate, at first the catalyst prepared in Example 1 was reduced for 5 hours at 350°C under the condition of pure hydrogen, or adding diluent gas, or synthesis gas, then the temperature of the bed was dropped to the specified reaction temperature, and the The feed gas reacts. The reactor is heated by an electric furnace, and the reaction temperature is determined by a thermocouple inserted into the catalyst bed. The composition of raw gas and product gas was detected by Angilent7890 gas chromatography.

Embodiment 3

[0038] Embodiment 3. the analytical method of product

[0039] The starting materials and the resulting products were analyzed using an Agilent 7890A gas chromatograph. The chromatograph is equipped with dual detectors FID and TCD, and has a ten-way valve, which allows the products to enter the packed column and capillary column respectively at the same time. The hydrogen flame detector detects hydrocarbons, alcohols and ethers in the product, and the thermal conductivity detector detects hydrogen and hydrogen in the raw materials and products. Data were processed with Agilent's Chemstation software.

[0040] The specific chromatographic conditions of Agilent are as follows:

[0041] Chromatography: Agilent 7890A

[0042] FID column: HP-PLOT-Q 19091S-001, 50m x 0.2mm (inner diameter), 0.5μm film thickness

[0043] Carrier gas: helium, 2.5ml / min

[0044] Oven temperature: 35°C for 5 minutes

[0045] 35-150°C, 5°C / min

[0046] 150℃ for 10min

[0047] Inlet: Split (50:1) ...

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Abstract

The present invention provides a method for preparing ethanol through low carbon ester hydrogenation. The method comprises that: a raw material gas containing a low carbon ester and hydrogen gas is subjected to a hydrogenation reaction through a reactor filled with a copper base catalyst at a reaction temperature of 200-320 DEG C under a reaction pressure of 0.5-20.0 Mpa at a volume space velocity of 1000-40000 h<-1> to prepare the ethanol, wherein the copper base catalyst adopts segmented loading, the low carbon ester in the raw material adopts segmented feeding, and a molar ratio of the low carbon ester to the hydrogen gas in the raw material gas is 1 / 2-1 / 100. According to the present invention, the raw material low carbon ester enters the segmentedly-loaded catalyst bed layer in a segmented manner so as to effectively control or adjust the temperature distribution of the catalyst bed layer, and avoid occurrence of warm spots, such that the side effects are reduced, the selectivity of the target product is increased, and the service life of the catalyst is substantially prolonged.

Description

technical field [0001] The invention belongs to the field of catalytic chemistry, and relates to a new fixed-bed catalytic process of multi-stage loading of catalysts and stage-feeding of low-carbon esters and its application. Background technique [0002] With the rapid development of modern industry, the contradiction between energy supply and demand has become increasingly prominent. my country, as a big energy consumer and a big energy shortage country, urgently needs to find alternative energy sources. As a clean energy source, ethanol has good miscibility and can be added to gasoline as a blending component to partially replace gasoline, increase the octane number and oxygen content of gasoline, effectively promote the full combustion of gasoline, and reduce the Emissions of CO and HC in exhaust gas. As a partial substitute of vehicle fuel, ethanol can make my country's vehicle fuel present a diversified structural feature. At present, my country mainly develops fue...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/08C07C29/149
CPCC07C29/149C07C31/08B01J23/745B01J23/80B01J23/83B01J23/868B01J23/8892B01J37/03B01J37/18B01J2523/00B01J2523/17B01J2523/27B01J2523/48B01J2523/305B01J2523/3712B01J2523/41B01J2523/47B01J2523/67B01J2523/72B01J2523/31B01J2523/842
Inventor 朱文良刘勇刘红超倪友明刘中民孟霜鹤李利娜刘世平周慧
Owner YANCHANG ZHONGKE (DALIAN) ENERGY TECH CO LTD
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