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 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 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.