49results about How to "Achieving Green Chemistry" patented technology

The invention provides a transaminase mutant and application thereof. The transaminase mutant is obtained by mutation of one or more amino acids in SEQ ID NO: 2 or is obtained by mutation of conserved amino acids in the 54th-63rd and the 84th-96th sites by taking the sequence SEQ ID NO: 1 of wild type CvTA transaminase as a reference. The catalytic activity of the mutants is improved to different extents compared with that of wild transaminase, so that when the mutants are used for synthesizing chiral amine compounds, particularly synthesizing large-steric-hindrance chiral amine, the production efficiency can be improved, and the industrial production cost can be reduced. And green chemical synthesis is carried out by adopting biological enzyme, so that industrial three wastes are reduced.

The invention relates to a preparation method of an antistatic ultra-high molecular weight polyethylene (UHMWPE) / graphene composite material. The method comprises the following steps: putting UHMWPE and graphene powder in a high-speed stirrer to be stirred to obtain UHMWPE / graphene composite particles, wherein the graphene powder is added to the high-speed stirrer in 2-50 times and the materials are stirred for 10-30 seconds each time at a speed of 10000-30000r / min; preheating the UHMWPE / graphene composite particles at 180-240 DEG C for 5-10 minutes, and then carrying out hot pressing for 30 minutes under the conditions of the same temperature and 10MPa, thus obtaining the UHMWPE / graphene material. The method has the beneficial effects that solvents are not involved in the method; the required antistatic composite material is prepared through electrostatic adsorption and hot press molding; the prepared material has a three-dimensional net structure; the percolation value of the material is slightly higher than that of the material prepared by a solution method.

The invention discloses a 3,3'-disubstituted-3-hydroxy bis-indolinone derivative and a preparation method and an application thereof. In the preparation method for the 3,3'-disubstituted-3-hydroxy bisindole ketone derivative disclosed by the invention, a one-step reaction is carried out on isatin and a diazo compound serving as raw materials by taking rhodium acetate as a catalyst and taking an organic solvent as a solvent, so that a product, i.e., the 3,3'-disubstituted-3-hydroxy bisindole ketone derivative is obtained. The preparation method disclosed by the invention has the advantages of high atom economy, high selectivity, high yield and the like, and is easy and safe for operating. The 3,3'-disubstituted-3-hydroxy bisindole ketone derivative prepared with the method is a precursor compound of a series of multi-indole ring-fused alkaloids.

The invention belongs to the diesel oil refining technology, especially a new technology for catalytically cracking light diesel fuel from waste motor oil. Currently, the drawbacks of the prior technology for refining the waste motor oil into diesel oil are that: the cetane number falls short of national standard and the chroma is deep and opaque, the recovery is low and the technology is complex. The new technology comprises the following steps: adding waste motor oil into a reaction kettle; adding a hone-made good catalyst accounting for 1 / 1000 of the weight of the waste motor oil; heating to 300-500 DEG C to make the waste motor oil catalytically crack, finally obtaining distillation product; putting the distillation product into a condenser, making the condensed liquid-sate light diesel oil and the tail gas through an oil-gas splitter, making the tail gas into a gas collector; split diesel oil flowing into a treatment tank, adding high efficiency treating agent with concentration of 5 / 10000 into the treatment tank, treating the diesel oil using a backflow spray head; finally layering and filtering the treated light diesel oil by an oil water splitter, namely the yellow transparent light diesel oil with flash point >55 DEG C is obtained, with recovery of higher 80%.

The present invention relates to a synthetic method of 1-methyl hydantoin, which belongs to synthetic method of compounds. The synthetic method includes following steps, adding 46.5g 30% aminomethane water solution, 106g 10% sodium carbonate water solution and 87.5g 20% 500ml 4-opening flasksodium monochloracetate water solution to react for 3 to 5hr at 50 to 70 DEG C; vaporizing to remove aminomethane and regulating pH value to 2; Heating to 100DEG C, dropping 91g 8% sodium cyanate water solution, agitating and reacting 30 minutes, adding 7.3g sodium cyanate solid to react 90 minutes, then cooling it to 5 DEG C, adding 25g concentrated sulfuric acid, heating to 100 DEG C and reflux reacting 2hr, generating crude product by vacuum distilling. The present invention is characterized in thatit implement green chemical because of avoiding using hypertoxic medicine of hydroxy acetonitrile and enhance the safety of operation, and its synthesis cost is low, entire syntheticroute is more simple, which is suitable for large scale industrial production.

The invention discloses a K ion-doped ZnO photocatalytic material, a preparation method and an application thereof. Dissolve the zinc salt in an organic solvent, pour a certain molar ratio of potassium salt or potash into the stirring zinc salt solution, and continue stirring until dissolved; place the resulting mixed solution in an oven to dry to obtain a precursor; Carry out high-temperature calcination to obtain K‑ZnO. The K ion-doped ZnO photocatalytic material prepared by the method of the present invention improves the defect that ZnO has low response to visible light, changes the energy band structure, improves the electron-hole separation rate, reduces the electron-hole recombination rate, and then can The photocatalytic activity is effectively improved, and the method is low in cost, simple in method and simple in operation. It can degrade organic pollutants under the irradiation of visible light.