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Method for synthesizing methyl isobutyl ketone/methyl isobutyl alcohol

A technology of methyl isobutyl alcohol and methyl isobutyl ketone, applied in the field of synthesizing methyl isobutyl ketone/methyl isobutyl alcohol, can solve high production cost, short production process and low production cost and other problems, to achieve the effect of low production cost, simple process and stable operation

Inactive Publication Date: 2004-04-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The three-step method was the main process before the 1970s. The advantage is that the production flexibility is large, and diacetone alcohol, mesityl oxide, methyl isobutyl ketone and methyl isobutyl alcohol can be produced according to market demand. The disadvantage is that The product yield is low, the process is long, the investment is large, and the production cost is high
The advantage of the method for synthesizing methyl isobutyl ketone from acetone in one step is that the production process is short, the catalyst selectivity is good, and the product production cost is low; the disadvantage is that 1. the reaction of synthesizing MIBK from acetone is a strong exothermic reaction, and this part of the heat cannot be fully utilized; ②This method has a high selectivity of MIBK, but the production product is single, only MIBK products can be produced, and MIBC products with higher added value cannot be co-produced
[0008] In order to overcome the shortcoming of the method for synthesizing methyl isobutyl ketone in one step from acetone, CA1289755A proposes a method for preparing MIBK by catalytic distillation of acetone and hydrogen as raw materials. The advantage of this method is to utilize the reaction heat of acetone to synthesize MIBK; Only MIBK products can be produced, with a single variety
[0009] CN1325837A has proposed a kind of method that takes MIBK as raw material direct hydrogenation to produce MIBC, and this method technology is comparatively simple, but this method is to take MIBK as raw material to produce MIBC, has increased the production cost of MIBC undoubtedly

Method used

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  • Method for synthesizing methyl isobutyl ketone/methyl isobutyl alcohol
  • Method for synthesizing methyl isobutyl ketone/methyl isobutyl alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0024] The specifications of the catalytic distillation tower are: the tower column is 25mm in diameter, the column length is 1200mm, the volume of the tower kettle is 800ml, and the whole tower body is made of stainless steel. The catalyst loading is divided into four sections from top to bottom, the first three sections are Pd / resin catalysts; the latter section is Pd / α-Al 2 o 3 catalyst. Specifically: 1. get 240ml of Pd / resin catalyst, divide into three sections (each section 80ml) and pack in the tower column of catalytic distillation tower. ②Take 80ml Pd / α-Al 2 o 3 The catalyst is loaded into the bottom section of the column of the catalytic distillation tower. Acetone and hydrogen undergo condensation and hydrogenation reactions in the first three stages of catalyst bed to generate MIBK; then MIBK flows into the fourth stage of catalyst bed, where part of MIBK undergoes further hydrogenation reaction to generate MIBC. The raw material hydrogen enters from the bottom...

Embodiment 6-9

[0031]The catalytic distillation tower used in the experiment, the catalyst loading amount, and the loading method are exactly the same as in Example 1. The difference is that in the experiment, a certain amount of acetone was added to the tower kettle at one time, hydrogen gas was continuously introduced, and the temperature was raised by using the tower kettle electric furnace. After the tower top and tower kettle reached the specified temperature, the temperature was kept constant for a certain period of time. After that, the operation was stopped, and the reaction liquid sample was taken for analysis. The details of the reaction conditions and results are shown in Table 2.

[0032] Example

Embodiment 10

[0034] The catalytic distillation tower used in the experiment, the catalyst loading amount, and the loading method are exactly the same as in Example 1. Specifically: ①Pd / resin catalyst is MK-2; ②Pd / α-Al 2 o 3 The catalyst is MC-2. Hydrogen and acetone are continuously fed, the ratio of hydrogen to acetone is 500 (v), and the space velocity of acetone feed is 1.5h -1 , the reaction pressure is 0.7Mpa, under this condition, a 500h stability experiment was carried out, and the results are shown in Table 3.

[0035] During continuous operation

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PUM

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Abstract

The invention provides a method for synthesizing methyl isobutyl ketone / methyl isobutyl ethyl by catalyst and distillation. In the catalyst and distillation pole, the upper part is filled with catalyst which has condensation and hydrotreating functions, the lower part is the catalyst with single hydrotreating function, acetone and hydrogen are put into the distillation tower after preheated, the product accumulates in the tower, the unreacted acetone is distilled out from the top of the tower and traced back to the tower to react again.

Description

1. Technical field [0001] The invention relates to a method for synthesizing methyl isobutyl ketone / methyl isobutyl alcohol by using acetone and hydrogen as raw materials. 2. Background technology [0002] Both methyl isobutyl ketone (MIBK) and methyl isobutyl alcohol (MIBC) are good medium boiling point solvents. Due to its good solubility and low viscosity, it can be used in a wide range of applications. [0003] Methyl isobutyl ketone is an excellent industrial solvent, used in paint, resin coating, lubricating oil dewaxing, etc. It is also an important raw material for synthetic rubber antioxidant 4020 and other chemical products. [0004] Methyl isobutyl alcohol is mainly used as a mineral flotation agent, such as extracting silicon and copper sulfate ore, etc.; as a solvent in the manufacture of lubricating oil additives. [0005] The production methods of MIBK and MIBC are the same, both adopt the route of using acetone as raw material, and produce two products at t...

Claims

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Application Information

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IPC IPC(8): C07C29/38C07C31/125C07C45/68C07C45/74C07C49/04
Inventor 艾抚宾吕志辉宋丽芝王海波王顺农陈明
Owner CHINA PETROLEUM & CHEM CORP
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