Method for recovering iodide from isophorone cracking material

A technology of isophorone and pyrolysis materials, applied in the direction of alkali metal iodide, etc., can solve the problems of non-conformity with green environmental protection technology, direct recovery of sodium iodide solids, etc., to reduce the risk of frequent operations, continuous and stable operation of the production process , the effect of reducing production costs

Active Publication Date: 2021-07-16
湖南瑞冠生物化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method needs to use a large amount of hydrochloric acid and oxidant, which is not in line with the green environmental protection process. At the same tim...

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  • Method for recovering iodide from isophorone cracking material
  • Method for recovering iodide from isophorone cracking material
  • Method for recovering iodide from isophorone cracking material

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Embodiment 1

[0040] See attached figure 1 The implementation of the process of the present invention mainly includes four parts: alkali washing system, concentration and recrystallization system, washing and drying system, and recycling system.

[0041] (1) Alkali washing system: the pyrolysis material produced by isophorone high-temperature cracking and aromatization is washed with sodium carbonate solution, and the iodide ion in the pyrolysis material is fully converted into sodium iodide. After standing still, 3,5 dimethylphenol was separated from the upper layer, and alkaline washing water was separated from the lower layer. Utilize the titration method to detect the iodide ion concentration in the alkali washing water, if the iodide ion concentration is lower than 40% (by weight), then the alkali washing water is recycled repeatedly to increase the iodide ion concentration in the water. When the sodium iodide concentration reaches 40% (by weight), the salinity of the alkali washing w...

Embodiment 2

[0051] 1000 Kg aromatization process is produced 3,5 xylenol cracking material is processed, and the iodide ion (converted from methyl iodide) that contains 5.8kg is contained in the cracking material, washes repeatedly with 100 Kg saturated sodium carbonate solution, will cracking The iodide ions in the material are fully converted into sodium iodide; after standing still, 670 Kg of 3,5 dimethylphenol is separated from the upper layer, and the alkali washing water is separated from the lower layer; the alkali washing water is recycled, when the concentration of sodium iodide When it reaches 40% (by weight), it is sent to an evaporation concentration kettle for concentration under reduced pressure, so that the concentration of sodium iodide is increased to 80% (by weight). The hot supersaturated sodium iodide solution was slowly cooled down to 25°C, and 5.55 Kg of sodium iodide crystals were precipitated. The sodium iodide crystals were washed with tetrachlorethylene to remove...

Embodiment 3

[0055] 1000Kg aromatization process is produced 3,5 xylenol cracking material is processed, and the iodide ion (converting out from methyl iodide) that contains 5.8kg is contained in the cracking material, washes with 100Kg saturated sodium hydroxide solution, will crack in the material The iodide ion is fully converted into sodium iodide; after leaving standstill, separate the 3,5 dimethylphenols of 310Kg from the upper layer, and separate the alkali washing water from the lower floor; the concentration of sodium iodide reaches 40% (by weight), Sent to the evaporation and concentration tank for concentration under reduced pressure, so that the concentration of sodium iodide was increased to 80% (by weight). The hot supersaturated sodium iodide solution was slowly cooled down to 25°C, and 5.10Kg of sodium iodide crystals were crystallized. The sodium iodide crystals were washed with tetrachloroethylene to remove impurities, and then evaporated by vacuum distillation to obtain ...

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Abstract

The invention discloses a method for recovering iodide from an isophorone cracking material, the method comprises the following steps: washing the cracking material for producing 3,5-dimethyl phenol by high-temperature cracking aromatization of isophorone with a metal salt solution, and fully converting iodide ions in the cracking material into iodide; after standing, separating 3, 5-dimethylphenol from the upper layer, and separating alkali washing water from the lower layer; concentrating the alkali washing water, crystallizing, washing and drying to obtain iodide solid; the metal salt solution is sodium carbonate, sodium bicarbonate, sodium acetate, potassium carbonate, lithium carbonate or ammonium carbonate. The whole process is simple and convenient to operate, the production process is continuously and stably operated, the risk of frequent operation of personnel is reduced, the safety is improved, the target product is obtained, the iodine element in the wastewater is recovered to a greater extent, the production cost of an enterprise is reduced, and the method is a green process.

Description

technical field [0001] The invention relates to a method for recycling industrial wastewater and zero discharge, in particular to a method for recovering iodide from isophorone cracking material. Background technique [0002] 3,5-Dimethylphenol (MX for short) is an important fine chemical raw material and organic intermediate. There are many downstream products and a wide range of applications. For example, it can be used to synthesize disinfectants, antioxidants, insecticides, and vitamin E. And so on, it plays a very important role in the fields of industry, agriculture, medicine and so on. Traditional 3,5-dimethylphenol synthesis methods mainly include coal tar extraction, cyclohexenone catalytic dehydrogenation, phenol alkylation, xylene sulfonation alkali fusion, xylene sulfonation, oxidative hydrolysis, acetone Gas-phase synthesis method and xylene diazotization method, etc. However, these methods have problems such as complex production process route, coking of catal...

Claims

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Application Information

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IPC IPC(8): C01D3/12
CPCC01D3/12C01P2006/80C01P2006/82
Inventor 廖范武唐裕才胡汉忠
Owner 湖南瑞冠生物化工科技有限公司
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