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Method for synthesizing sec-butyl alcohol

A technology of sec-butanol and sec-butyl acid, which is applied in the field of synthesizing sec-butanol, can solve the problems of difficult product separation, serious equipment corrosion, high production cost, etc., and achieve the effects of easy separation and purification, high conversion rate and increased yield

Inactive Publication Date: 2015-01-28
ZHUHAI FEIYANG NOVEL MATERIALS +1
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Problems solved by technology

In industrial production, sec-butyl propionate is mainly synthesized by alkyd esterification, that is, propionic acid and sec-butanol are used as raw materials, and dehydrated and esterified under the action of an acidic catalyst to synthesize sec-butyl propionate, but the production cost of this process is High, serious equipment corrosion, many side reactions, difficult product separation, and the generated wastewater will cause environmental pollution

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  • Method for synthesizing sec-butyl alcohol
  • Method for synthesizing sec-butyl alcohol

Examples

Experimental program
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Embodiment 36

[0035] Synthesis of sec-butyl propionate: the synthesis method and reaction conditions of this embodiment and embodiment 11 are basically the same, the difference is: the synthesis reaction continues to run for 150h; Feed into the reaction raw materials, so that the synthesis reaction continued for 150h. Detect the reaction situation at the beginning of the reaction (the reaction is carried out for 2h) and the operation time of 150h.

[0036] Initial reaction conditions: the conversion of propionic acid was 70.2%, and the selectivity of sec-butyl propionate was 98.7%.

[0037] The reaction situation when running for 150 hours: the conversion rate of propionic acid is 67.6%, and the selectivity of sec-butyl propionate is 97.6%.

[0038] Hydrolyzed sec-butyl propionate:

[0039] The water in the water storage tank is first sent to the preheater to be heated to 100°C through the metering pump, and then sent to the lower part of the hydrolysis tower (hydrolysis reactor). At the...

Embodiment 74-80

[0052] Influence of the content of n-butene in the n-butene raw material on the reaction:

[0053] Among the embodiment 74-80, the addition reaction of propionic acid and n-butene is basically the same as that of Example 11 (the molar ratio of n-butene and propionic acid is 2:1), the difference is that: will contain 20wt% n-butene The n-butene raw materials of butenes were respectively replaced with n-butene raw materials containing 10wt%, 20wt%, 40wt%, 50wt%, 60wt%, 80wt%, and 99wt% of n-butenes.

[0054] The hydrolysis reaction of the sec-butyl acrylate obtained through the addition reaction is identical to that of Example 61.

[0055] The reactions of Examples 74-80 are shown in Table 5 below.

[0056] The reaction result of table 5 embodiment 74-80

[0057]

[0058] In other embodiments, the preheating temperature before the material enters the hydrolysis tower can also be 80-100°C.

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Abstract

The invention relates to the technical field of organic synthesis, and in particular relates to a method for synthesizing sec-butyl alcohol. The method comprises the following steps: firstly, performing addition reaction to synthesize sec-butyl propionate from an n-butene raw material and propionic acid, and secondly, performing hydrolysis reaction on sec-butyl propionate, thereby obtaining a target product sec-butyl alcohol. According to the method, under specific reaction conditions, with the combination of addition reaction and hydrolysis reaction, n-butyl alcohol is synthesized in a roundabout mode, the reaction condition is gentle, the reaction selectivity is high, the conversion rate is high, products are easy to separate and purify, the requirement on the content of n-butene in the n-butene raw material is low, and when the content of n-butene is 20wt%, the conversion rate of propionic acid can be up to 70.5%, and the selectivity is as high as 98.7%. By adopting the method, the yield of sec-butyl alcohol can be increased to be 47.1% from 10% of a catalytic hydration method, the yield is greatly increased, and thus the method can be used in industrialization production.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a method for synthesizing sec-butanol. Background technique [0002] Second-butanol is an important raw material for the preparation of methyl ethyl ketone, which currently accounts for about 90% of the consumption of second-butanol. In addition, with the shortage of petroleum resources, it has become a trend to reconcile gasoline instead of gasoline as vehicle driving fuel. The existing blended gasoline includes methanol gasoline, ethanol gasoline, methyl tert-butyl ether gasoline, butanol gasoline, and sec-butanol gasoline that have appeared in recent years. Compared with the first four blended gasolines, sec-butanol gasoline has the following advantages: without using additives and without modifying the engine, it can greatly reduce the cost of raw materials and reduce the pollution of automobile exhaust, and its octane number is higher , easier to biodegrade, good...

Claims

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Application Information

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IPC IPC(8): C07C31/12C07C29/09
CPCC07C67/04C07C29/095
Inventor 肖增钧张静邱小勇龚树华何国殿
Owner ZHUHAI FEIYANG NOVEL MATERIALS
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