6results about How to "Reduce post-processing costs" patented technology

This invention provides a method for preparing 1,2-propanediol and its application. The method includes: step (1): in the presence of an acidic catalyst and water, ring-opening of a first portion of propylene oxide to obtain an acid-catalyzed reaction solution containing 1,2-propanediol; step (2): in the presence of an alkaline catalyst and water, ring-opening of a second portion of propylene oxide to obtain an alkaline-catalyzed reaction solution containing 1,2-propanediol; step (3): mixing the obtained acid-catalyzed reaction solution and the alkaline-catalyzed reaction solution for a neutralization reaction to obtain a mixture containing 1,2-propanediol; wherein, the molar ratio of the first portion of propylene oxide to water in step (1) and the molar ratio of the second portion of propylene oxide to water in step (1) are each independently 1:1-5; using the method of this invention to prepare 1,2-propanediol requires only a lower water ratio to obtain a higher propylene oxide conversion rate and 1,2-propanediol content, and the wastewater volume is lower and the color is colorless after the reaction.

The invention relates to a method for synthesizing lesinurad, which comprises the following steps of: sequentially performing aldehyde-thiosemicarbazide condensation, cyclization, bromination and hydrolysis reaction on a compound 4-cyclopropyl naphthalene-1-formaldehyde as shown in a formula I serving as a raw material to obtain a compound lesinurad as shown in a formula V; according to the invention, a 1, 2, 4-triazole ring is constructed by an innovative strategy of aldehyde-thiosemicarbazide condensation-cyclization, so that tedious steps of a traditional step-by-step process are omitted, and the cyclization yield is increased from 85% to 92%; the method is mild in overall reaction condition, low in equipment damage, simple in process, green and environment-friendly, capable of ensuring continuous production of high-quality products and high in application value.

This invention discloses a method for purifying a mixture containing polyphenylene sulfide (PPS). The method comprises the following steps: S1, washing the PPS-containing mixture with an organic solvent to obtain a first intermediate product; the first washing is performed under microwave heating at a temperature of 60-150°C; S2, washing the first intermediate product with an aqueous acid solution to obtain a second intermediate product; S3, washing the second intermediate product with water to obtain a purified PPS product; the third washing is performed under microwave heating at a temperature of 60-150°C. The purification method for the PPS-containing mixture of this invention is highly efficient and low-cost, and the obtained purified PPS product has a yellowness of no more than 7 and a salt content of less than 0.3%.

This invention discloses a ketoisomerase mutant, its preparation method, and its applications, relating to the field of biotechnology. The ketoisomerase mutant is obtained by mutating or combining mutations at positions 65, 136, and 190 of the amino acid sequence of the ketoisomerase shown in SEQ ID NO.1. Through recombinant bacterial construction, screening for efficient ketoisomerases via fermentation, and subsequent biotransformation and purification, 1-keto-D-chiral inositol was prepared. This invention lays the foundation for the study of the properties of 1-keto-D-chiral inositol and has significant application value.

The utility model belongs to the technical field of flow batteries, and particularly relates to a gas circulation system of a flow battery. The flow battery gas circulation system comprises a positive electrode liquid storage tank, a negative electrode liquid storage tank, a gas inlet pipeline, a gas exhaust pipeline, a gas pressure balance pipeline and a gas transfer device, the upstream end of the air inlet pipeline is positioned above the liquid level of the positive electrode liquid storage tank; the downstream end of the gas inlet pipeline is communicated with the inlet of the gas transfer device; the outlet of the gas transfer device is communicated with the upstream end of the exhaust pipeline; the downstream end of the exhaust pipeline is located below the liquid level of the negative electrode liquid storage tank. And two ends of the air pressure balance pipeline are respectively communicated to positions above the liquid levels of the positive electrode liquid storage tank and the negative electrode liquid storage tank. The gas transfer and reactive gas absorption process is realized, volatile gas and toxic waste gas can be quickly and effectively absorbed, the pressure balance of the positive and negative electrode liquid storage tanks is maintained, the change of active components of the electrolyte during operation is avoided, and the safety and high efficiency of long-time operation of the flow battery are maintained.

This invention relates to the field of laser cutting technology and discloses a laser cutting device for copper plates used in copper crafts processing. The device includes a laser cutting machine housing and a laser cutting head. Y-axis linear motors are mounted on both sides of the top of the laser cutting machine housing, and a portal frame is positioned between the Y-axis linear motors. An X-axis linear motor is fixed to one side of the top beam of the portal frame. The laser cutting head is fixed to one end of the slide. A fixing ring is fixed to the lower half of the outer wall of the laser cutting head, and an external gear ring is fixed to the outside of the fixing ring. This invention achieves a 360° adjustable preheating and rapid cooling mechanism around the laser cutting head, allowing it to follow the cutting direction of the laser cutting head in real time. This ensures that the electric heating plate always precisely covers the area to be cut, and the hollow water-cooled housing always precisely covers the cutting area, achieving seamless integration of preheating, cutting, and rapid cooling. This maximizes the effects of preheating and rapid cooling, further improving cutting accuracy and cut quality.