Method for preparing lignin-based 3-ethyl adipic acid or 3-propyl adipic acid

The invention discloses a method for preparing lignin-based 3-ethyl adipic acid or 3-propyl adipic acid, which comprises the following step: carrying out oxidation reaction on naphthenic alcohol and/or naphthenic hydrocarbon with a catalyst and an oxidant to obtain 3-ethyl adipic acid or 3-propyl adipic acid. According to the preparation method provided by the invention, integration of lignin depolymerization and lignin depolymerization product reduction can be realized, and lignin-based 3-ethyl adipic acid or 3-propyl adipic acid can be finally prepared through oxidation. The method provided by the invention can greatly improve the selectivity of lignin-based 3-ethyl adipic acid and 3-propyl adipic acid, and the selectivity is as high as 98%.

Method for determining concentrations of endogenous amino acid asparagines and glutamine through LC-MS

The invention belongs to the medical examination field, and aims to provide a method for accurately determining the concentrations of endogenous amino acid asparagines and glutamine in a blood plasma or serum sample. The method can be used for accurately, simply and rapidly evaluating the in-vivo medicine effect of a leukemia patient treatment medicine asparaginase. The method adopts an LC/MS spectrometer to determine the concentrations of endogenous amino acid asparagines and glutamine in the blood plasma or serum sample. The method comprises the following steps: processing a blank matrix, preprocessing the blood plasma or serum sample to be detected, and separating and analyzing the blood plasma or serum sample to be detected.

All-lignocellulose-based polyester and preparation method thereof

The invention discloses full lignocellulose-based polyester and a preparation method thereof.The polyester is shown in the formula I. The preparation method of the polyester comprises the following steps that S1, lignin or lignocellulose is subjected to a depolymerization reaction, and a lignin depolymerization product and delignified fiber residues are obtained; s2, the lignin depolymerization product obtained in the step S1 is subjected to a reduction reaction and an oxidation reaction, and 3-propyl adipic acid is obtained; s3, performing enzymolysis on the fiber residues obtained in the step S1 to prepare sugar, and performing fermentation to obtain 1, 4-butanediol and 2, 5-furandicarboxylic acid; and S4, carrying out esterification reaction and condensation polymerization on the 3-propyl adipic acid obtained in the step S2, the 1, 4-butanediol obtained in the step S3 and the 2, 5-furandicarboxylic acid to obtain the product. According to the invention, the lignocellulose is used as ...

Garden area planning method and device for low-carbon city and storage medium

The invention provides a garden area planning method and device for a low-carbon city and a storage medium. The method comprises the steps that carbon dioxide information recorded by each carbon dioxide detection point in a historical time period and corresponding position coordinates are acquired; sequentially judging whether each carbon dioxide detection point is a to-be-processed detection point representing that the carbon dioxide exceeds the standard or not based on the carbon dioxide information, and if so, marking the position coordinate corresponding to the to-be-processed detection point as a reference position coordinate; the city is divided into a plurality of areas based on the to-be-processed detection points, the areas comprise to-be-planned areas and non-planned areas, the to-be-planned areas do not comprise other carbon dioxide detection points except the to-be-processed detection points, and the non-planned areas do not comprise the to-be-processed detection points; and ...

Method for preparing high diet fiber powder by biodegradation of citric acid waste dregs

Special microwave modified calcite powder for polypropylene and preparation method of microwave modified calcite powder

The invention discloses microwave modified calcite powder special for polypropylene. The microwave modified calcite powder is prepared from, by mass, 120-180 parts of calcite powder, 40-60 parts of graphene liquid, 3-5 parts of hexadecyl sulfate and 1-3 parts of coupling agent. The coupling agent is any one of a silane coupling agent or titanate. The preparation method of the modified calcite powder comprises the following steps: weighing the raw materials according to the proportion, then stirring and mixing the calcite powder, the graphene liquid, the hexadecyl sulfate and the coupling agent at a high speed for 15-25 minutes at the temperature of 90-120 DEG C under a microwave condition, then stirring at a low speed for 3-5 minutes, cooling and discharging. And drying the modified calcite powder and polypropylene, mixing according to a ratio, uniformly mixing, granulating in a double-screw extruder, and carrying out injection molding to obtain the composite material. The technical problem ...

Method and system for promoting insisting in breast feeding

The invention relates to the technical field of medical apparatus and instruments, in particular to a method and a system for promoting insisting in breast feeding, which are characterized in that infant swallowing sound in a breast feeding process is collected, a swallowing number calculation method is adopted, a swallowing sound frequency is analyzed, spotted milk is identified, a weighted swallowing number is generated, and the insisting in breast feeding is promoted by combining the swallowing number and key indexes. A breast milk intake is obtained through a breast milk intake estimation model formed by an artificial intelligence deep learning technology, a 24-hour breast milk feeding evaluation result and a monitoring curve graph are generated in combination with multivariate data, in combination with a clinical reference value, through transverse and longitudinal comparison evaluation, risk classification division and breast milk feeding guidance information feedback, breast milk ...

Electroplating treatment equipment for magnetic material and treatment method thereof

The invention discloses electroplating treatment equipment for magnetic materials and a treatment method thereof.The electroplating treatment equipment for the magnetic materials comprises a transverse sliding rail and an electroplating bin, a moving mechanism is slidably arranged on the lower end face of the transverse sliding rail, a telescopic arm is fixedly connected to the bottom of the moving mechanism, and a suspension mechanism is arranged in the middle of the telescopic arm; the suspension mechanism is arranged in the electroplating bin and comprises a rotating plate, a suspension plate, a driving plate and a connecting column, the connecting column is fixedly connected to the end, away from the moving mechanism, of the telescopic arm, the driving plate is rotationally connected to the outer end face of the connecting column, and the rotating plate is rotationally connected with the driving plate; and one side of the rotating plate is rotationally connected with a suspension plate ...