Ethyl alcohol and acetic ether-containing mixed solvent

Abstract

The invention provides a mixed solvent product with acetic ether and ethyl alcohol which serve as main components. The solvent product contains 30 to 75 weight percent of the ethyl alcohol and 20 to 60 weight percent of the acetic ether; an acid value is 0 to 5 mg / L, which is calculated based on acetic acid, and the moisture content is 0 to 20 weight percent.

Description

technical field [0001] The present invention relates to a kind of mixed solvent product, more specifically, the present invention relates to a kind of this solvent product obtained by hydrogenation of acetic acid, and its preparation method and application. Background technique [0002] Ethyl acetate, also known as ethyl acetate, is one of the important downstream products of acetic acid, with excellent solubility and quick drying. The production methods of ethyl acetate mainly include acetic esterification method, acetaldehyde condensation method, ethanol dehydrogenation method and acetic acid / ethylene addition method. At present, ethyl acetate in the world is mainly produced by acetic esterification method . [0003] Ethanol is the earliest and most widely used fatty alcohol. The raw materials used by my country's main ethanol production enterprises are corn, wheat and cassava (mainly relying on imports). In fact, the cost of food has risen sharply in recent years, so e...

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Problems solved by technology

In these patents, acetic acid is generally removed first by rectification, which can reduce the material requirements in the subsequent separation, thereby reducing investment costs, but there are also some problems: ethanol and ethanol, which account for the vast majority of product quality Water needs to be vaporized, so the energy consumption of rectification and deacidification is extremely high, and the deacidification tower has a large size and high material requirements, and the investment cost is extremely high; and in the actual rectification separation, there may be a very small amount of In the case of acetic acid, fuel ethanol and industrial ethanol products have strict requirements on acidity, so the product is unqualified in the case of operational fluctuations

[0008] On the other hand, a certain amount of ethyl acetate can be generated in the direct hydrogenation process of acetic acid. Ethyl acetate and ethanol are binary azeotropes, and ethyl acetate, ethanol and water are ternary azeotropes. Prior art such as CN102414153 Among them, ethyl acetate is mainly returned to the hydrogenation reactor, which will cause an increase in reactor load and production energy consumption, so it is economical and practical to extract ethyl acetate as a product

[0009] In order to solve the defects in the ethanol purification process existing in the prior art and overcome the recycling problem of the by-product ethyl acetate, the inventor, after in-depth and meticulous research, proposed a low-energy solution: acetic acid is directly hydrogenated into crude ethanol The product is then passed through the gas-liquid separator and refined (including a neutralization reactor) successively to obtain the mixed solvent while obtaining the ethanol product

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