Production technology of p-hydroxy benzaldehyde and production system thereof

Abstract

The invention discloses a production process of p-hydroxybenzaldehyde, which includes sodium salt reaction, oxidation reaction, acidification reaction and product purification treatment. The purification treatment is as follows: after the crude product of p-hydroxybenzaldehyde obtained by the reaction is dissolved in water, activated carbon is added. Decolorize and filter to remove activated carbon residue; then the filtrate is purified and crystallized, and the crystallized solid-liquid mixture is centrifuged, and finally flash-dried. A production system for a p-hydroxybenzaldehyde production process, comprising a reaction still, a distillation still, a first filter, an acidification still, a first crystallization still, a first centrifuge, a decolorizing still, a second filter, a second Crystallization kettle, second centrifuge and flash dryer. In the present invention, the crude product is further treated with activated carbon for decolorization and refining and crystallization, and the obtained product has high purity; waste gas, waste water and waste residue are all treated in a concentrated manner before being discharged, so that the pollution to the environment is very small; and the yield is high. , simple operation and other advantages.

Description

technical field [0001] The invention relates to a production process of p-hydroxybenzaldehyde and a production system thereof. Background technique [0002] p-Hydroxybenzaldehyde is a very important fine chemical intermediate, widely used in spices, medicine, pesticides, cosmetics, electroplating and other fields. For example, p-hydroxybenzaldehyde can be used to synthesize many precious spices such as anisaldehyde, vanillin, jasminaldehyde, syringaldehyde, fennel and raspberry. In medicine, p-hydroxybenzaldehyde is mainly used in the synthesis of antibacterial synergists such as methoxybenzylamine, ampicillin, hydroxybenzapamycin, trimethoxybenzaldehyde, p-hydroxymethanol glucose, p-hydroxyphenylglycine, The sputum medicine rhododendron, artificial Gastrodia elata, esmolol, etc. can also be used to synthesize antihypertensive drugs, antihyperlipidemia drugs, cardiovascular disease drugs, and drugs for the treatment of skin diseases and eye diseases. In agriculture, the ha...

AI Technical Summary

Problems solved by technology

The catalyst reported in this patent has a complex structure, is difficult to prepare, and is difficult to carry out large-scale production

[0004] However, most of the above methods have problems such as low product yield, low purity, serious environmental pollution, large equipment investment, and difficult product separation.

Images