8 results about "Solvent refining" patented technology

This application relates to the field of organic synthesis technology, specifically disclosing a process for preparing tert-butyl vinyl ether. The raw materials include solid tert-butanol, acetylene, tetrahydrofuran solvent, and potassium hydroxide catalyst, supplemented with auxiliary materials such as type 3A molecular sieves and activated alumina adsorbents. The preparation method involves: after dehydration and purification of the raw materials, the materials are introduced into a reaction vessel; temperature and pressure are controlled, and the reaction endpoint is monitored using an infrared spectrometer; byproducts are quenched and acetylene is recovered; the process involves multi-stage condensation, water washing to remove impurities, distillation separation, and solvent purification and recycling, with simultaneous integration of waste heat recovery and continuous material feeding. The tert-butyl vinyl ether prepared by this process, as an important fine chemical intermediate, can be used in coatings, adhesives, and polymer material modification, possessing advantages such as high purity and good stability. The preparation method achieves efficient utilization of materials and energy through multi-stage synergistic linkage, combining the advantages of green environmental protection, continuous and stable operation, and high resource utilization.

This invention belongs to the field of chemical recycling technology, specifically relating to an apparatus and method for treating toluene diisocyanate tar residue. This invention combines a pre-fractionation tower, a solvent dehydration tower, and a solvent refining tower into a single complex tower (partition wall tower), thereby optimizing the process flow and improving energy efficiency. It also features thermal coupling and equipment integration, achieving a high degree of coupling between matter and energy during the separation process, saving on equipment investment and energy.

The invention discloses a method and equipment for processing and producing second-class base oil by taking first-class base oil regenerated by waste lubricating oil as a raw material, and belongs to the technical field of regenerated lubricating oil. Atmospheric and vacuum distillation is combined with NMP solvent refining, and the waste lubricating oil is regenerated into qualified first-class base oil to serve as an exclusive raw material; preheating the raw material to 60-80 DEG C under the protection of nitrogen, and introducing the preheated raw material into an adsorption column at a flow rate of 0.5-2.0 BV / h, so that the raw material sequentially passes through a macroporous silica gel layer (the particle size is 0.1-1.5 mm) and an active white clay layer (the mass ratio of the macroporous silica gel layer to the active white clay layer is 2: 1) with specific parameters, and deep synergistic adsorption refining is carried out; after the refined oil enters a storage tank, vacuum is applied to suck residual oil in the column into the tank, and second-class base oil is obtained after heat preservation sedimentation and precise filtration. Under the mild non-hydrogenation condition, high added value upgrading of the waste lubricating oil is achieved, and the method has the comprehensive advantages of being efficient in process, high in product yield, stable in quality and low in energy consumption and cost.

The application discloses an NMP solvent refining and concentrating recovery device and a control method. The device comprises an absorption tower, a three-stage series connection rectifying tower group, a reflux system, a PLC main controller, a sensor group and an actuator. Gradient dewatering and step-by-step refining are realized through a vertical tower body structure and a waste heat recovery assembly. The control method comprises online calculation of the separation efficiency of each tower, the actual product purity and the total reflux ratio of the system based on real-time collected concentration and process parameters, automatic switching of the purification degree, energy saving or maintenance mode according to the purity and energy consumption state, and cyclic regulation and control of the reflux ratio and heating power of each tower. Through three-stage gradient rectification, waste heat recovery and PLC three-tower coupling regulation and control, the application can output high-purity semiconductor-grade NMP, effectively reduce the system energy consumption and improve the operation stability.

The application relates to a method for preparing siloxane by a semi-continuous homogeneous phase reaction and application, which utilizes the principle of solubilization of LiCl in THF solution to MgCl 2、 ZnCl2, regulates a reaction solvent system, and enables the whole reaction process to be carried out under the condition of a homogeneous phase solution. The method takes chlorosilane as raw material, carries out a condensation reaction in an organic solvent in the presence of metal oxide, and the organic solvent is a co-blended solvent of a weak polarity or non-polarity solvent and tetrahydrofuran. The raw material source is abundant, the method for preparing siloxane by a homogeneous phase reaction of organic chlorosilane and metal oxide is beneficial to realization of a semi-continuous process, materials are kept in a homogeneous phase process in the reaction, thereby the filtration of metal chloride salt is reduced, the reaction process period is shortened, the reaction temperature is not more than 60 DEG C, the condition is mild, the product siloxane and inorganic salt by-products such as zinc chloride and magnesium chloride are separated by distillation respectively, and the separation is fast and simple; after solvent refining, the two solvents can be reused.

The application discloses a kind of slurry method preparation polyolefin systems, including polymerization reaction unit, slurry solid-liquid separation unit, drying devolatilization unit, incondensable gas recovery unit and solvent refining unit.The application provides the system of slurry method preparation ethyl hexyl copolymer with pentane as solvent, which can be applied to large chemical industry.In the slurry solid-liquid separation unit of the application, slurry separation is carried out by pressure solid-liquid separation, polyethylene slurry from the reaction unit is directly introduced into pressure centrifuge for solid-liquid separation without cooling through heat exchanger, solvent loss is less, energy consumption can be effectively reduced, and the process is short, the number of equipment is less, which can reduce floor area.

The invention relates to a method and system for producing food-grade white oil and industrial white oil by using coal tar hydrogenation tail oil, and the method comprises the following steps: S1, enabling the coal tar hydrogenation tail oil to enter a solvent refining unit for solvent refining treatment to obtain raffinate oil and extract oil; s2, H2 and the raffinate oil enter a hydro-upgrading unit to be in contact with a hydro-upgrading catalyst, hydro-upgrading reaction is carried out, a hydro-upgrading reaction product is obtained, and the hydro-upgrading catalyst comprises a hydrotreating catalyst, a hydrodewaxing catalyst and a hydrofining catalyst; s3, enabling the hydro-upgrading reaction product to enter a steam stripping unit, and performing high-pressure steam stripping to obtain a gas-phase component and a liquid-phase component; s4, enabling the liquid-phase component to enter a post-hydrogenation refining unit to be in contact with a post-hydrogenation refining catalyst, and carrying out post-hydrogenation refining reaction to obtain a post-hydrogenation refining product; s5, allowing the hydrogenated refined product to enter a separation unit for separation treatment to obtain aviation kerosene, food-grade white oil and industrial white oil.

The utility model discloses a coarse solvent powder removal system and a solvent recovery system after production of polyethylene by a slurry method. The utility model relates to a powder removal system for a crude solvent after production of polyethylene by a slurry method. The powder removal system comprises a mixing device for alkali liquor and a powder-containing crude solvent, a layering device, a solid-liquid separation device and a waste liquid collection device, wherein a discharge port of the alkali liquor and powder-containing coarse solvent mixing device is connected with a feed port of the layering device. According to the coarse solvent powder removal system, a catalyst is inactivated and powder is removed before solvent refining, the problem that the catalyst is unstable in the system is solved, the problem that a downstream solvent refining system is blocked due to the fact that powder separation is not thorough in the solvent recovery process of a slurry method polyethylene device is solved, the process is simple, the powder removal effect is good, and the cost is low. And the project economy is good.