Recently, "China Chemical Industry News" published "Achieving Pollution-Free Production in the Whole Production Process——Isobutylene in the Green Petrochemical Process叔 Co-production of butanol methodMMA/MAO" article, for our company’s carbon four method co-productionMMA/MAO's process advantages, production characteristics and future promotion space are positively evaluated.

Publication:

Methyl methacrylate (MMA) is an important chemical raw material. It is a monomer for the production of optically transparent materials such as optical fibers and light guide plates. The traditional production process is the acetone cyanohydrin method. Methyl allyl alcohol (MAO) is the raw material of the new water reducing agent, and the traditional process is the chlorohydrin method. Although the acetone cyanohydrin method and the chlorohydrin method have serious pollution, the investment is small and the cost is low, so most enterprises are still applying them.

In order to change this status quo and help the green development of the industry, Heze Huali New Materials Co., Ltd. independently developed the isobutylene/tert-butanol co-production MMA/MAO process, which achieved pollution-free production in the whole process, and therefore was selected as List of Petrochemical Green Processes (2019 Edition).

Co-production of carbon four methodMMA/MAO

Chen Xinjian, chairman of Heze Huali New Materials Co., Ltd., said that the isobutylene/tert-butanol co-production MMA/MAO process they independently developed uses non-toxic materials and by-products, which is currently the only one. Green process for co-production of C4 MMA/MAO.

According to him, the isobutylene/tert-butanol co-production MMA/MAO process uses isobutylene/tert-butanol as raw materials to produce methacrolein through oxidation, and a part of methacrolein is then oxidized to produce methacrylic acid. Acrylic acid and methanol undergo an esterification reaction to form MMA; another part of methacrolein is dehydrogenated to form MAO.

Chen Xinjian mentioned that the company has always been committed to becoming an internationally competitive manufacturer of MAO, methacrylic acid, MMA and their polymers. In addition to this green process, the company has undertaken a number of national, provincial and municipal scientific research and development projects, and has applied for a number of patents, of which 7 invention patents and 10 utility models have been authorized.

Green production process

According to Chen Xinjian, the production of MMA by acetone cyanohydrin method and MAO by chlorohydrin method have been restricted by the state. In 2008, the acetone cyanohydrin method MMA was listed as a high-pollution and high environmental risk process in the "National Environmental Protection Comprehensive List" of the Ministry of Environmental Protection; the acetone cyanohydrin method was listed as a restriction in the "2011 Industrial Structure Adjustment Guidance Catalogue" of the National Development and Reform Commission Category; The Negative List for Market Access issued by the Ministry of Commerce of the National Development and Reform Commission also included the acetone cyanohydrin method MMA as a ban on new petrochemical projects. Similarly, the chlorohydrin MAO process is listed as a highly polluting and high environmental risk process by the "Comprehensive List of Environmental Protection (2014 Edition)" issued by the Ministry of Environmental Protection.

Both processes use highly toxic raw materials, which pose high environmental risks, produce large amounts of waste water and waste residues, and are difficult to treat. Among them, the chlorohydrin method uses highly toxic chlorine gas as a raw material, and consumes 1.4 tons of chlorine gas per ton of MAO, 3 tons of waste hydrochloric acid by-product, and more than 10 tons of waste water containing sodium chloride by-product. These salty, oily, and chlorine-containing wastewater and waste residues are extremely difficult to treat. The acetone cyanohydrin method uses highly toxic hydrocyanic acid and highly corrosive sulfuric acid as raw materials, and produces more than 10 tons of waste water containing ammonium bisulfate and cyanide for every 1 ton of MMA product produced. Some companies even use cyanide-containing ammonium bisulfate in these wastewaters as fertilizers to the market.

Compared with these two traditional processes, the isobutylene/tert-butanol co-production MMA/MAO process uses isobutylene and tert-butanol with only three elements of carbon, hydrogen, and oxygen as raw materials, and the oxidant used is air to reduce The agent is hydrogen, no toxic and harmful substances such as chlorine, hydrocyanic acid and sulfuric acid are used, and the atom utilization rate is high. The produced process waste gas is discharged through catalytic incineration, the low-concentration wastewater is subjected to biochemical treatment, and the high-concentration wastewater is sent to the incinerator to burn by-product steam.

There is still room for future promotion

“In terms of production capacity, the total annual production capacity of my country’s MMA is about 1.23 million tons, of which only 340,000 tons are applied with green processes, accounting for only about 1/4 of the total annual production capacity. Promotion space. "Chen Xinjian said, "However, due to the small investment in traditional crafts and low costs, it is difficult to promote green crafts."

According to him, in recent years, there are still many sets of acetone cyanohydrin MMA projects approved. Among them, some projects have been approved with an annual production capacity of 450,000 tons, and the production cost is lower than the green process, which makes it impossible to promote the green process. . Chen Xinjian said that companies should not simply take profit as the sole purpose, and suggested that relevant departments should strictly implement the "National Industrial Structure Adjustment Catalog" and "Environmental Protection Comprehensive Directory" and other related policies, and increase the promotion of green technology.

“In the future, we will continue to carry out technological development, promote the technological upgrading of green processes, and enhance the competitiveness of green processes. "Chen Xinjian said that in the next step, Heze Huali New Material Co., Ltd. will continue to promote the development of green craftsmanship with the aim of technological innovation and green development.