Abstract: The invention provides a method for preparing pyrrolidone, and the invention provides a method for catalytically preparing pyrrolidone with ?-aminobutyric acid in the presence of carnitine-CoA ligase CaiC. The carnitine-CoA ligase CaiC has an amino acid sequence as shown in SEQ ID NO:1. The ligase has catalytic activity in the cyclization of ?-aminobutyric acid to produce pyrrolidone. The carnitine-CoA ligase provided in the present invention affords a yield of pyrrolidone of 3.26 g/L and a molar yield of 39.53% in 24 h when ?-aminobutyric acid is used as a substrate, thus reducing the production period, improving the production of pyrrolidone, and accelerating the industrialization process of producing pyrrolidone by enzymatic conversion method.

Abstract: The present invention provides a vertical gas distribution device for aerobic compost and a gas distribution method. Current gas distribution pipelines are easily blocked by organic materials, resulting in poor ventilation due to non-uniform local ventilation and cleaning difficulties. The inventive device comprises a compost chamber, a compost bin, a compost heap, a percolate tank, and a plurality of gas distribution branch pipes at the bottom of the compost chamber, the pipes being vertically movable in the chamber; the percolate tank is positioned at the bottom of the chamber and under the pipes; an air inlet is provided on the side wall of the tank, and an outlet is provided on the side wall of the chamber; the compost bin is inside the compost chamber, and the compost heap is in the compost bin; each pipe is top sealed, with a plurality of vent holes on the side wall, and its bottom connected to the tank. The present invention is usable for compost ventilation.

Abstract: The present disclosure relates to a device and method for remedying a heavy-metal-polluted soil with a microorganism, and relates to a device for remedying a metal-polluted soil and a remediation method thereof. The present disclosure solves the problem that a remediation microorganism cannot be extracted from the soil. The device comprises a main plate and a plurality of microorganism-extracting chambers, wherein the main plate is connected to the microorganism-extracting chambers; the microorganism-extracting chamber are filled with a filler; a tail end of the microorganism-extracting chambers is spiky, and openings are separately provided on a side wall of the microorganism-extracting chambers. The method comprises: I, adding a nutrient medium to the soil, and then inoculating a remediation microorganism; and II, inserting the above device into the soil for 6˜8 days, and then taking it out. The method can remedy heavy-metal-polluted soil in a short time with a high removal rate of the heavy metal.

Abstract: The present invention provides a modified composite molecular sieve, and a preparation method and an application of the modified composite molecular sieve. The modified composite molecular sieve comprises SiO2 and a composite molecular sieve that comprises molecular sieve MCM-22 and crystalline molecular sieve selected from at least one of ZSM-22, ZSM-23 and ZSM-48, wherein, the molecular sieve MCM-22 covers around the crystalline molecular sieve. The present invention further provides a catalyst and an application of the catalyst. The catalyst comprises a carrier and a noble metal loaded on the carrier, wherein, the carrier comprises a modified composite molecular sieve that is the modified composite molecular sieve provided in the present invention or the modified composite molecular sieve obtained with the method provided in the present invention.

Abstract: The present invention provides a vertical gas distribution device for aerobic compost and a gas distribution method. Current gas distribution pipelines are easily blocked by organic materials, resulting in poor ventilation due to non-uniform local ventilation and cleaning difficulties. The inventive device comprises a compost chamber, a compost bin, a compost heap, a percolate tank, and a plurality of gas distribution branch pipes at the bottom of the compost chamber, the pipes being vertically movable in the chamber; the percolate tank is positioned at the bottom of the chamber and under the pipes; an air inlet is provided on the side wall of the tank, and an outlet is provided on the side wall of the chamber; the compost bin is inside the compost chamber, and the compost heap is in the compost bin; each pipe is top sealed, with a plurality of vent holes on the side wall, and its bottom connected to the tank. The present invention is usable for compost ventilation.

Abstract: The present disclosure relates to a device and method for remedying a heavy-metal-polluted soil with a microorganism, and relates to a device for remedying a metal-polluted soil and a remediation method thereof. The present disclosure solves the problem that a remediation microorganism cannot be extracted from the soil. The device comprises a main plate and a plurality of microorganism-extracting chambers, wherein the main plate is connected to the microorganism-extracting chambers; the microorganism-extracting chamber are filled with a filler; a tail end of the microorganism-extracting chambers is spiky, and openings are separately provided on a side wall of the microorganism-extracting chambers. The method comprises: I, adding a nutrient medium to the soil, and then inoculating a remediation microorganism; and II, inserting the above device into the soil for 6˜8 days, and then taking it out. The method can remedy heavy-metal-polluted soil in a short time with a high removal rate of the heavy metal.

Abstract: The present invention provides a modified composite molecular sieve, and a preparation method and an application of the modified composite molecular sieve. The modified composite molecular sieve comprises SiO2 and a composite molecular sieve that comprises molecular sieve MCM-22 and zeolite A selected from at least one of ZSM-22, ZSM-23 and ZSM-48, wherein, the molecular sieve MCM-22 covers around the zeolite A. The present invention further provides a catalyst and an application of the catalyst. The catalyst comprises a carrier and a noble metal loaded on the carrier, wherein, the carrier comprises a modified composite molecular sieve that is the modified composite molecular sieve provided in the present invention or the modified composite molecular sieve obtained with the method provided in the present invention.

Abstract: The present invention discloses a catalyst for paraffin isomerization, as well as a preparation method and use thereof. The catalyst comprises a TON molecular sieve modified by rare earth, an inorganic refractory oxide modified by zirconium oxide and a noble metal of group VIII. The weight ratio of the TON molecular sieve modified by rare earth to the inorganic refractory oxides modified by zirconium oxide is 10:90 to 90:10, and the content of the metal of group VIII is 0.1 to 10 wt % based on the metal. When used in the process of isomerization dewaxing of various raw materials containing paraffins, the catalyst can not only decrease the solidifying points of raw oil containing paraffins, but also increase the yield of liquid products. Particularly, when used in the process of isomerization dewaxing of lubricating oil distillates, the catalyst is advantageous in producing base oil for lubricating oil with a high a higher yield, a lower pour point (solidifying point) and a higher viscosity index.

Abstract: The present invention discloses a catalyst for paraffin isomerization, as well as a preparation method and use thereof. The catalyst comprises a TON molecular sieve modified by rare earth, an inorganic refractory oxide modified by zirconium oxide and a noble metal of group VIII. The weight ratio of the TON molecular sieve modified by rare earth to the inorganic refractory oxides modified by zirconium oxide is 10:90 to 90:10, and the content of the metal of group VIII is 0.1 to 10 wt % based on the metal. When used in the process of isomerization dewaxing of various raw materials containing paraffins, the catalyst can not only decrease the solidifying points of raw oil containing paraffins, but also increase the yield of liquid products. Particularly, when used in the process of isomerization dewaxing of lubricating oil distillates, the catalyst is advantageous in producing base oil for lubricating oil with a high a higher yield, a lower pour point (solidifying point) and a higher viscosity index.