7results about How to "Increase mass concentration" patented technology

The invention discloses a method for separating a methanol-methylal mixture, and relates to the technical field of chemical separation. The method mainly comprises the following steps: carrying out light component removal treatment on the NMP waste liquid to remove light component impurities such as water; the extraction agent NMP light component removal waste liquid and the methanol-methylal mixed liquid are subjected to countercurrent contact in an extractive distillation tower, and methylal with the purity higher than 99.9 wt% is obtained at the tower top; the materials in the bottom of the extractive distillation tower enter a methanol refining tower, and methanol with the purity higher than 99 wt% is obtained at the top of the tower; and feeding the material at the bottom of the methanol refining tower into a de-heavy tower, obtaining high-purity NMP steam at the top of the de-heavy tower, and obtaining heavy-component impurities at the bottom of the de-heavy tower. According to the method, the NMP light component removal waste liquid is used as an extraction agent, and coupling reinforcement in the separation process is utilized, so that the separation of the methanol and methylal azeotropic system is realized, and the production material consumption and energy consumption cost are reduced.

The invention discloses a ZSM-5 molecular sieve, a catalyst for preparing ethylbenzene through benzene alkylation and preparation and application of the catalyst. According to the ZSM-5 molecular sieve, the b-axis thickness is 30-100 nm, and the exposure degree of a crystal face perpendicular to the b-axis direction is 65%-75%. When the catalyst prepared from the ZSM-5 molecular sieve and used for preparing ethylbenzene through benzene alkylation is used for a reaction for preparing ethylbenzene through benzene alkylation, the ethylene conversion rate is high, the selectivity of ethyl in an alkylated product is high, and the mass content of key impurity dimethylbenzene is low.

The invention discloses a magnetic nanoparticle mass concentration calculation method based on the full width at half maximum of a nuclear magnetic resonance spectrum, and belongs to the technical field of magnetic nano material testing. The relationship between the mass concentration of the magnetic nanoparticles and the full width at half maximum of the magnetic resonance spectrum is established, the saturation magnetization intensity of a single magnetic nanoparticle is fixed, so that the change of the mass concentration of the magnetic nanoparticles is essentially the change of the number of the magnetic nanoparticles, and the mass concentration and the full width at half maximum of the magnetic resonance spectrum have a linear relationship; the change of the mass concentration of the magnetic nanoparticles can be reflected by measuring the full width at half maximum of the magnetic resonance spectrum, so that the measurement of the mass concentration of the magnetic nanoparticles is realized.

The present application relates to the preparation of composite membranes and the separation of methanol dehydration technology, aiming at providing a preparation method of zinc ion hydrophilic metal organic framework mixed polyvinyl alcohol composite membrane. Including: Zn(NO3)2.6H2O, PVP and 2-cyano imidazole are reacted, and the reaction product is sequentially subjected to amidation modification and hydroxyl modification reaction to obtain a zinc ion hydrophilic metal organic framework, which has a microstructure of being externally modified by hydroxyl and amide groups and internally hollow; polyether sulfone ultrafiltration membrane is used as a support membrane, polyvinyl alcohol solution containing the organic framework is dried on the upper part of the support membrane to form a polyvinyl alcohol mixed matrix membrane, and the composite membrane is formed by cross-linking at the contact interface. The present application can preferentially adsorb water molecules and improve the solubility of water in the membrane; water molecules can be selectively passed through, effectively improving the permeability and selectivity of the polyvinyl alcohol membrane to water, and high-purity methanol products can be obtained after cyclic dehydration; by adding MOF fillers and interfacial cross-linking, the present application can maintain good mechanical, chemical and thermal stability.

The invention discloses a magnetic nanoparticle mass concentration measuring method based on nuclear magnetic resonance spectrum chemical shift, and belongs to the technical field of magnetic nano material testing. The relationship between the mass concentration of the magnetic nanoparticles and the magnetic resonance spectrum chemical shift offset is established, and due to the fact that the saturation magnetization intensity of a single magnetic nanoparticle is fixed, the change of the mass concentration of the magnetic nanoparticles is essentially the change of the number of the magnetic nanoparticles. The mass concentration and the magnetic resonance spectrum chemical shift offset have a linear relationship, and the change of the mass concentration of the magnetic nanoparticles can be reflected by measuring the magnetic resonance spectrum chemical shift offset, so that the measurement of the mass concentration of the magnetic nanoparticles is realized.

The invention relates to the technical field of functional microorganism screening and application, and particularly provides novel bacillus pumilus and application thereof in aquaculture. The preservation number of the bacillus pumilus is CCTCC (China Center For Type Culture Collection) NO: M2024808, and the bacillus pumilus can be used for remarkably inhibiting various pathogenic bacteria, reducing the content of ammoniacal nitrogen and nitrite nitrogen in an aquaculture water body and improving the water quality, and also has very strong degradation capability on microcystin. The strain can effectively improve the growth performance of aquatic animals, enhance the immunity and oxidation resistance of the aquatic animals, and can be widely applied to the field of aquatic feed production.

The present invention is a system and method for three-stage concentrated phosphoric acid, belonging to the field of chemical industry. The system uses high-potential medium-pressure saturated steam to indirectly heat phosphoric acid to generate secondary steam and tertiary steam to continue to heat phosphoric acid, making full use of high-potential heat energy while reducing heat loss. The currently widely used low-pressure saturated steam one-stage concentrated phosphoric acid requires 1.2 to 1.3 tons of low-pressure saturated steam to evaporate 1 ton of water. The present invention uses medium-pressure saturated steam to concentrate phosphoric acid in three stages, and only consumes 0.5 to 0.6 tons of steam to evaporate 1 ton of water. The steam utilization efficiency is high, the steam consumption is saved, and the production cost is reduced.