Diketene preparation device and preparation method

Abstract

The invention relates to a diketene preparation device and a diketene preparation method. The diketene preparation device comprises an acetic acid evaporator, a mixer, a cracking furnace, a quenching condenser and an absorption tower. The outlets of the acetic acid evaporator and the mixer are connected with the cracking furnace; the cracking furnace is then connected with the multi-level quenching condenser; the quenching condenser is then connected with the absorption tower; one branch of the absorption tower is connected with a polymerization tank, and the other branch of the absorption tower is connected with a water absorption tower; and the outlet of the third-level quenching condenser is connected with the quenching condenser behind through a liquid ring pump. The diketene preparation device and diketene preparation method provided by the invention have the beneficial effects that when the cracked gas is pressurized, the impurities such as acetic acid, water and acetic anhydride in the cracked gas can be condensed out more sufficiently, and thus the quality of the cracked gas before entering the absorption tower is improved while the freezing level is lowered; and compared with the traditional technology in which the energy consumption accounts for 45% of the total cost of diketene, the device and method provided by the invention have the advantage that the energy consumption only accounts for 25% of the total cost of diketene through improvement.

Description

technical field [0001] The invention belongs to the field of diketene preparation, and in particular relates to a diketene preparation device and a preparation method. Background technique [0002] Diketene, also known as acetylketene, diketene, colorless or slightly yellow liquid, has a strong pungent smell, molecular formula: C 4 h 4 o 2 , molecular weight 84.08, because diketene contains two double bonds in its structure and is highly unsaturated, so it has high chemical activity in organic synthesis, and it can react with alcohols, amines, halogens, aldehydes, acids, etc. It is an important intermediate in organic synthesis and is widely used in medicine, pesticides, dyes, food and other industries. [0003] There are two main production methods of diketene, one is the acetone method, the other is the acetic acid method, and the most widely used and most common method is the acetic acid method, because the diketene produced by this method is of high quality and has go...

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Problems solved by technology

[0022] In order to solve the need for rapid cooling after the cracking of acetic acid in the prior art, avoid diketene polymerization; effectively separate acetic acid, acetic anhydride and water, avoid causing ketene polymerization to produce high polymers and affect product quality and yield; and solve the existing process. The problem of large cooling power consumption and high energy consumption

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