Method for processing sludge from papermaking and pulping by using earthworms, method for separating sludge and earthworms

Abstract

The invention discloses a new process for synthesis of asenapine. The asenapine is prepared through adopting a compound (18) as a key intermediate and carrying out the following steps that: 1.1, the compound 18 is subjected to a Ullmann reaction under a alkaline condition through adopting copper powder as a catalyst to generate a ether (19); 1.2, the ether (19) is subjected to a carbonyl reduction to obtain the target compound of the asenapine (1). The process has the following advantages that: cheap and available 2-bromobenzaldehyde is adopted as an initial raw material and is subjected to a condensation, a addition, a reductive amination and a intramolecular cyclization reaction, a aminomethylation, a open loop transposition and then loop closing, a demethylation and a Ullmann loop closing reaction to synthesize of the asenapine (1); cis-trans-isomer is subjected to a delicate transposition to obtain a trans-product, such that the process is simplified and easy to be operated; the raw material is easy to be obtained and has cheap price; each reaction is a normal reaction, and reaction conditions are mild; a total yield is substantially improved; production cost is reduced; a purity of the product is more than 99% through a detection by HPLC.

Description

technical field [0001] The invention relates to a method for treating papermaking pulping sludge with earthworms and a method for separating sludge and earthworms, and belongs to the technical field of earthworm reaction. Background technique [0002] With the development of the papermaking industry and the construction of pollution prevention and control facilities, the sludge produced after biochemical treatment of papermaking wastewater has become a new source of pollution. Paper pulping biochemical sludge produces a large amount, has a great impact on the environment, and has a low degree of resource utilization. At present, the treatment of sludge basically adopts the method of a landfill. This method occupies a large area and causes pollution to the environment. Due to the high water content, it poses a safety hazard to the dam body. It is understood that taking Fuyang City as an example, every day The amount of sludge produced after treatment by the sewage treatment ...

AI Technical Summary

Problems solved by technology

Paper pulping produces a large amount of biochemical sludge, which has a great impact on the environment and a low degree of resource utilization

At present, the treatment of sludge basically adopts the method of a landfill. This method occupies a large area and causes pollution to the environment. Due to the high water content, it poses a safety hazard to the dam body. It is understood that taking Fuyang City as an example, every day The amount of sludge produced after treatment by the sewage treatment plant is about 3,000 tons

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