Excuse me, how is industrial grade copper acetate made?

At present, the main preparation methods of industrial ethyl acetate in the world are acetic esterification, acetaldehyde condensation, ethylene additive process and ethanol dehydrogenation. The traditional acetic esterification process has been gradually eliminated abroad, and the large-scale production devices are mainly acetaldehyde condensation and ethanol dehydrogenation. In areas rich in acetaldehyde raw materials, acetaldehyde condensation devices with a capacity of more than 10,000 tons have been widely used. Dehydrogenation of ethanol is a new technology developed in recent years, which has been popularized in areas with abundant ethanol resources and low cost. The latest production method of ethyl acetate is ethylene additive process. 1998, a 50 kt/a production plant was built in Malacu by using the patented technology of Showa Electric.

Esterification of (1) acetic acid

Acetic acid esterification is a traditional production method of ethyl acetate, which is obtained by esterification of acetic acid and ethanol in the presence of catalyst.

ch 3c H2 oh+ch 3c ooh = ch 3c ooch 2ch 3+H2O

Ethanol acetic acid ethyl acetate water

High yield can be obtained by removing the generated water through reaction. The main disadvantages of producing ethyl acetate by this method are high cost and strong corrosion of equipment, which is an eliminated process route in the world.

(2) acetaldehyde condensation method

In the presence of aluminum ethoxide catalyst, two molecules of acetaldehyde are automatically oxidized and condensed and rearranged to form one molecule of ethyl acetate.

2CH3CHO→CH3COOCH2CH3

Ethyl acetaldehyde acetate

This method has formed large-scale production devices in Europe, America, Japan and other places in the 1970s, which has obvious advantages in production cost and environmental protection.

(3) Dehydrogenation of ethanol

Crude ethyl acetate was prepared by dehydrogenation of ethanol with copper-based catalyst, and the boiling matter was removed by high and low pressure distillation to obtain ethyl acetate with purity over 99.8%.

2C2H5OH→CH3COOCH2CH3+H2

Ethanol ethyl acetate hydrogen

(4) Ethylene additive process

In the presence of heteropoly acid metal salt or heteropoly acid supported on silica and other carriers as catalyst, ethylene is directly esterified with vaporized acetic acid after gas phase hydration to produce ethyl acetate.

CH2CH2+CH3COOH=CH3COOCH2CH3

Ethyl ethylene acetate

As far as ethylene is concerned, the conversion of acetic acid is 66% and the selectivity of ethyl acetate is 94%. Rona Planck, Showa Electric, BP and other multinational companies have developed this production process.