4results about How to "Stable and mature process" patented technology

The invention discloses a fatty acid salt coking inhibitor as well as a preparation method and application thereof, and belongs to the technical field of coking inhibitors. According to the technical scheme, fatty acid reacts with a potassium compound to obtain the coking inhibitor, wherein the fatty acid is one or a mixture of oleic acid and stearic acid, and the potassium compound is potassium hydroxide, potassium carbonate or potassium bicarbonate. The coking inhibitor disclosed by the invention can be directly added into cracking raw oil for heavy raw material cracking furnaces such as diesel oil and tail oil, and injection equipment such as an inhibitor nozzle does not need to be additionally arranged independently, so that the unnecessary blocking risk is reduced, and the process complexity is reduced; and compared with the existing sulfur and phosphorus-containing oil-soluble inhibitor, the coking inhibitor provided by the invention has good decoking performance for middle and later-stage gas-phase coking.

The invention provides an ultra-light prepreg with a sandwich structure and a preparation and forming process thereof, the ultra-light prepreg with the sandwich structure comprises a first fiber reinforced layer, a thermal self-expansion layer and a second fiber reinforced layer, the thermal self-expansion layer is located between the first fiber reinforced layer and the second fiber reinforced layer, and the thermal self-expansion layer, the first fiber reinforced layer and the second fiber reinforced layer integrally form the sandwich structure in a mold. The method can be used for forming a thin-wall product with the thickness of 0.4 mm-2mm, and is different from a foaming mode of foaming shaping and prepreg sandwich forming of traditional shaped foams such as PVC (polyvinyl chloride) and PMI (polymethacrylimide), so that not only can the forming problem of complex shapes or thin-wall special shapes be solved, but also the delamination phenomenon caused by inconsistent resin systems of a sandwich structure surface layer and a sandwich layer can be improved, and the product quality is improved. And the good performance of the product is ensured. The method can be directly cut into a die for forming, so that the working procedures are reduced, and the production cost is reduced.

The invention discloses a palmitate coking inhibitor as well as a preparation method and application thereof, and belongs to the technical field of coking inhibitors. According to the technical scheme, palmitic acid reacts with a potassium compound to obtain the coking inhibitor, wherein the potassium compound is potassium hydroxide, potassium carbonate or potassium bicarbonate. The coking inhibitor has good oil solubility and can be directly added into cracking raw oil, injection equipment such as an inhibitor nozzle does not need to be additionally arranged independently, the unnecessary blocking risk is reduced, and the process complexity is reduced; and compared with the existing sulfur and phosphorus-containing oil-soluble inhibitor, the coking inhibitor provided by the invention has good decoking performance for middle and later-stage gas-phase coking.

This invention belongs to the field of ceramic membranes and electronic chemical recycling, specifically relating to a method for preparing an ultraporous ceramic membrane for NMP purification. The method includes the following steps: (1) pretreatment of the ceramic membrane; (2) modification treatment of the ceramic membrane; and (3) preparation of the ultraporous ceramic membrane for NMP purification. Compared with existing technologies, the advantages of this invention are: 1) This invention can efficiently purify NMP from NMP waste liquid with different impurity contents, has a wide range of applications, and does not generate new pollutants during the entire process. The process is mature and stable and can be applied to the recycling and comprehensive treatment of various NMP-containing waste liquids. 2) This invention uses specific ultraviolet (UV) light irradiation conditions to modify the ceramic membrane surface. The surface grafting polymerization technology mainly focuses on the formation of active centers. Furthermore, the UV grafting modification only occurs on the surface of the ceramic membrane material and does not damage the internal structure of the ceramic membrane material. The ceramic membrane has good stability, high purity of NMP waste liquid recovery, and few impurity ions.