Method for preparing methyl bromide, high-carbon hydrocarbon, methyl alcohol and dimethyl ether by methane

A technology of methane and brominated alkanes, which is applied in the field of methane bromination oxidation, can solve the problems of uneven distribution of active components, loss of active components, crystallization, etc., and achieve uniform distribution of active components, improved selectivity, and good stability sexual effect

Inactive Publication Date: 2010-06-09
MICROVAST POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the active component precursor is dried in the solution, the concentration of the solution is constantly increasing, and there may be a phenomenon of crystallization due to excessive concentration, thus forming independent active component clusters during the roasting process , instead of being uniformly loaded on the surface of the carrier, forming an uneven distribution of active components
In addition, even if the active components are loaded on the surface of the carrier, during the reaction, the loss of the active components may occur over time, thereby reducing the catalytic activity of the reaction, and the catalytic stability of the catalyst is poor.

Method used

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  • Method for preparing methyl bromide, high-carbon hydrocarbon, methyl alcohol and dimethyl ether by methane
  • Method for preparing methyl bromide, high-carbon hydrocarbon, methyl alcohol and dimethyl ether by methane
  • Method for preparing methyl bromide, high-carbon hydrocarbon, methyl alcohol and dimethyl ether by methane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Catalyst preparation:

[0067] Weigh 6.300g of oxalic acid solid and dissolve it in 100mL deionized water to obtain solution A, and weigh RhCl with a metering mass of 0.10224g 3 ·3H 2 O was dissolved in 50 mL of deionized water to obtain solution B, and 34.5831 g of tetraethoxysilane liquid was weighed and added to solution A to form two mutually immiscible liquids. After sealing and stirring for 1 hour, the solution becomes a uniform colorless and transparent homogeneous solution. Add solution B and continue to stir for 0.5 hours. Then put the mixed solution in a 120°C oven and dry it until it becomes a colloidal solid, and then put the colloidal solid in Heat up to 900°C at a heating rate of 200°C / h in the muffle furnace, maintain the temperature for 10 hours and then cool down. After the temperature drops to room temperature, take out the catalyst, sieve to 20-60 mesh, and finally get 0.40% Rh / SiO 2 -900-10 catalyst ("0.40%" indicates the mass percentage of the cor...

Embodiment 2～6

[0073] Catalyst preparation:

[0074] According to the preparation method of catalyst in embodiment 1, use the RhCl of different concentration 3 ·3H 2 O solution 50.0mL deionized water to obtain solution B, wherein RhCl 3 ·3H 2 The concentration of the O solution is the conversion amount of the required different mass fractions of Rh. Each catalyst shown in Table 1 was obtained.

[0075] Catalyst Test:

[0076] According to the testing conditions of the catalyst in Example 1, the reaction was carried out under the same reaction conditions. The experimental results are listed in Table 1.

[0077] The experimental result (influence of Rh content) of table 1 embodiment 1~6

[0078]

[0079]

Embodiment 7～12

[0081] Catalyst preparation:

[0082] According to the preparation method of the catalyst in Example 1, different calcination temperatures and times were used in the muffle furnace. Catalysts with different specific surface areas, namely the respective catalysts shown in Table 2, were finally obtained.

[0083] Catalyst Test:

[0084] According to the test method of the catalyst in Example 1, the reaction was carried out under the same reaction conditions. The experimental results are listed in Table 2.

[0085] The experimental result of table 2 embodiment 1, embodiment 7~12 (the influence of roasting temperature in the catalyst preparation process, catalyst composition 0.40%Rh / SiO 2 )

[0086]

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PUM

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Abstract

The invention discloses a method which is characterized in that methane is converted into bromohydrocarbon by bromine oxidation reaction, and bromohydrocarbon is further prepared into high-carbon hydrocarbon, methyl alcohol and dimethyl ether. Firstly, methane, HBr / H2O and oxygen react to generate bromo-alkane; the catalyst is a composite catalyst prepared by mixed hydrolysis, drying and roasting of silicon precursor and metallic compound precursor capable of dissolving in water; then, the bromo-alkane is performed with de-HBr to prepare high-carbon hydrocarbon, or bromo-alkane reacts with water to prepare methyl alcohol and dimethyl.

Description

technical field [0001] The invention belongs to the field of natural gas synthesis chemical raw materials, in particular to a method for methane bromination oxidation. Background technique [0002] With the dwindling of petroleum resources, the conversion of natural gas into high value-added chemicals has received more and more attention. At present, it has been proved that there are abundant natural gas reserves on the earth. The natural gas reserves in China alone have reached 124 trillion cubic meters, ranking 22nd in the world's natural gas reserves. Natural gas contains a large amount of methane, which can vary from 60% to 99%, with the remainder mainly ethane and propane. At present, a large amount of low-level alkanes in oilfield exploitation are still burned in the form of torches, which not only wastes resources, but also increases the concentration of carbon dioxide in the atmosphere and pollutes the environment. The research on the effective utilization of natur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/03C07C17/154C07C29/09C07C31/04C07C43/04C07C41/01
CPCB01J23/6562B01J23/63B01J21/08B01J29/7053B01J23/6482C07C1/26B01J29/7057B01J23/8926B01J29/088B01J23/6525B01J29/087B01J29/405B01J23/462B01J23/892C07C17/154B01J23/464B01J23/60C07C29/124C07C41/09B01J37/033B01J23/6522B01J23/6527B01J23/44Y02P20/52
Inventor 周小平李文生刘振杰夫·徐
Owner MICROVAST POWER SYST CO LTD
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