50results about How to "High industrial production value" patented technology

The invention discloses a synthetic method of steroidal gestagen and key medium I, II, III, IV in the drug chemical technological domain, which adopts 13 ethyl- 1,3,5(10),8(9)- estrange tetraenes-17-alcohol as raw material to synthesize deoxidation pregnancy and depending pregnancy.

The invention provides a method for synthesizing p-hydroxyacetophenone. The method comprises the following steps: firstly, 4'-chloroacetophenone is synthesized from chlorobenzene and acetic anhydrideas raw materials under catalysis of a Lewis acid catalyst, and the yield is 85%-91%; secondly, 4'-chloroacetophenone is hydrolyzed in an alkaline aqueous solution at high temperature and high pressure, p-hydroxyacetophenone is precipitated after acidification and cooling, and the yield is 90%-98%. The total yield of the two-step reaction is 77%-89%. Chlorobenzene is used as a starting material tosynthesize the p-hydroxyacetophenone, phenol used as the starting material in the traditional process is discarded, so that the defects that phenol is discharged with sewage and is not environmentallyfriendly as a result of incomplete reaction are avoided, and the method has high industrial production value.

The invention provides silicon-containing aromatic diamine and a preparation method thereof. Di-substituted silane and 4-vinylaniline or 3-aminostyrene are taken as raw materials and have a hydrosilation one-pot reaction under the action of a platinum catalyst, and di-substituted di(amino-phenethyl) silane is prepared. In the compound, two benzene rings containing amino are linked with the same silicon atom through two carbon atoms respectively, and the compound has excellent flexibility, flame retardancy and heat resistance. A synthetic process has the characteristics of easiness in obtaining of raw materials, simplicity in operation, mild conditions, high product yield, low cost, environmental protection and the like, and silicon-containing aromatic diamine has higher industrial production value.

The invention discloses a method for preparing a 7 Alpha-bromo steroid compound, comprising the following steps that: in the presence of a catalyst, a bromo reagent is in contact with a steroid compound having 7 Beta-oxhydryl to implement the stereoscopic selective bromation to the steroid compound having 7 Beta-oxhydryl, then the corresponding 7 Alpha-bromo steroid compound can be collected from reaction products. The method has advantages of simple operation, environment-friendly process, maximum 99 percent yield, low production costs and rather high industrialized production value.

The invention discloses a preparation method of an aluminum hydroxide surface modified expansible graphite flame retardant and a method for preparing flame-retardant polyurethane foam plastic by using the same, belongs to the field of flame-retardant materials, and particularly relates to a preparation method of a modified expansible graphite flame retardant and a method for preparing flame-retardant polyurethane foam plastic by using the modified expansible graphite flame retardant. The invention aims to solve the problems that the existing aluminum hydroxide flame retardants are more uniformly dispersed in polyurethane foam, and the mechanical property of the existing polyurethane foam plastic is poorer. According to the preparation method, sodium hydroxide, aluminum hydroxide and expandable graphite are used as raw materials, and a hydrothermal method is adopted. The method for preparing the flame-retardant polyurethane foam plastic comprises the following steps: 1, weighing; 2, mixing; and 3, curing. The method has the advantages that the limit oxygen index can be increased to 28.5%; the compression strength is improved to 0.162 MPa, and the percentage of closed area is improved. The methods are mainly used for preparing the aluminum hydroxide surface modified expandable graphite flame retardant and flame-retardant polyurethane foam plastic.

The invention belongs to the technical field of preparation of heterocyclic compounds, and specifically relates to a preparation method for amination synthesis of N-methylpiperidine from 1,5-pentanediol. The method comprises the following steps: with 1,5-pentanediol and monomethylamine as raw materials, carrying out an amination reaction in a tubular reactor filled with two upper-and-lower layersof a catalyst so as to obtain a crude product, and carrying out refining so as to obtain the N-methylpiperidine. The preparation method provided by the invention uses equipment with small size, is simple for industrial amplification, has relatively low cost and small technical investment, and can reach a product purity of 98.0% or above.

The invention provides a multistage sewage treatment device and a sewage purification system and relates to the field of sewage purification. The multistage sewage treatment device comprises a device body, an oxygen supply device, a dissolved oxygen measurement device and a control system, wherein a sewage inlet and a purified water outlet is arranged on the device body; the device body further includes a settling section, a swirling oil-gas separation section, a large particulate matter filtration section, and a fine-particle filtration section which are sequentially arranged from top to bottom; the sewage inlet is arranged on the settling section and the purified water outlet is arranged on the fine-particle filtration section; the oxygen supply device is connected to the swirling oil-gas separation section through an oxygen supply pipe; the dissolved oxygen measurement device comprises a dissolved oxygen electrode which is arranged in the swirling oil-gas separation section and a dissolved oxygen meter which is electrically connected with the dissolved oxygen electrode and is arranged outside the device body; the dissolved oxygen meter and the oxygen supply device are electrically connected to the control system. The multi-stage sewage treatment device has the advantages that usage is simple, automation degree is high, sewage treatment effect is good, industrial production value is greater.