Method for producing hydroquinone through electrocatalytic reduction of p-benzoquinone

Abstract

The invention discloses a method for producing hydroquinone through the electrocatalytic reduction of p-benzoquinone. According to the method, p-benzoquinone serves as a raw material, iron powder is utilized as a reducing agent, the hydroquinone is produced through a completing reduction reaction in an acid solution, and the iron powder adopted by the method is cast iron powder. An auxiliary electrocatalytic process is added in a reduction reaction process. Compared with the prior art, the method does not need to add not only zinc powder for secondary reduction but also ferrous sulphate and a proper amount of hydroquinone before the reaction; and moreover, the utilization ratio of the cast iron powder is increased to 75% from the original 37%. Generally, the method has the characteristics of low cost, easiness in operation, short time, high utilization ratio of iron powder, high yield of the hydroquinone and the like. When a theoretical amount of iron powder is added, the reaction pH is maintained between 3 and 4, and the reaction is carried out at 95 DEG C for 1-2 hoirs, so that the yield of the hydroquinone can reach above 90%.

Description

technical field [0001] The invention relates to a method for preparing hydroquinone by using p-benzoquinone as a raw material. Background technique [0002] Hydroquinone[C 6 h 4 (OH) 2 ] Also known as hydroquinone (HQ), is a common chemical raw material, widely used in medicine, pesticides, dyes and rubber, and even in fertilizers, water treatment, liquid crystal polymers and other fields. There are many methods for preparing hydroquinone. The aniline oxidation method is the main method for industrial production of hydroquinone in my country. The chemical reaction process of this method is mainly divided into two steps. The first step is to place aniline in a sulfuric acid medium and use manganese dioxide or sodium dichromate as an oxidizing agent to oxidize it to p-benzoquinone (C 6 h 4 o 2 ); the second step is to place p-benzoquinone in an acidic solution, and use iron powder (cast iron powder is used in many factories) as a reducing agent to reduce p-benzoquinone t...

AI Technical Summary

Problems solved by technology

Yet, the production technology that prepares hydroquinone with aniline oxidation method is not satisfactory, mainly there are following two problems in the production process: the one, the productive rate of hydroquinone is not high, and this is of course first to improve (intermediate product) yield of p-benzoquinone, and then it is possible to increase the yield of hydroquinone

Second, the consumption of raw materials is high, a large amount of manganese slag and iron sludge are produced, and the environment is seriously polluted.

That is to say, this prior art not only has the deficiency that the utilization rate of iron powder is still low, but also the generation of unavoidable iron sludge is not much reduced.

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