42results about How to "Continuous purification" patented technology

The invention discloses a method for separating and purifying epigallo catechin gallate (EGCG) by using a simulated moving bed (SMB) chromatography. The method is characterized in that: a tea leaf extract, which is tea polyphenol, is adopted as a raw material; EGCG is separated and purified by using an SMB chromatography system. According to the method, fundamental zones of the SMB are set as an eluting zone, a refining zone and an absorbing zone. The eluting zone is independent. Octadecylsilane chemically bonded silica ODS is adopted as a stationary phase, a mixed solution of alcohol and water is adopted as a mobile phase, and SMB separation are carried out two times upon a tea polyphenol raw material liquid, wherein one time is for removing impurities which are hard to elute, and the other time is for removing impurities which are easy to elute. The product is processed through a solvent removing process, such that the EGCG product is obtained. With the method, EGCG can be stably, continuously, and automatically purified from tea polyphenol in large scale, and with high efficiency. The recycling rate of the product is above 94%, and the purity of the product is above 96%. According to the invention, the stationary phase and the mobile phase can be repeatedly utilized, such that the cost is reduced. The invention belongs to green and environment-friendly separation engineering.

The invention provides a method for extracting steviol glycosides in stevia rebaudiana by simulated moving bed chromatography, which belongs to the purification method of natural plant effective components. In the process of extracting steviol glycosides, column chromatography purification is a key step, but the amount of resin is large, the utilization rate is low, the regeneration cycle is long, and a large amount of waste water is generated, most of which are batch operations. The SMBC separation technology using C18 as the stationary phase in the present invention can purify steviol glycosides from stevioside crude extracts in a large-scale, robust, continuous, automatic and efficient manner, and the stationary phase and mobile phase can be used repeatedly, reducing the cost of purification and belonging to green Environmentally friendly separation process. Combining water leaching and chromatographic impurity removal, water consumption and energy consumption are reduced, flocculation and impurity removal are not required, stationary phase does not need special regeneration, waste water discharge is reduced, and the process is simple.

The invention provides a method for purifying citrus glycosides, which belongs to the technical field of purification of natural plant monomers. In the method, firstly, the maggotin is extracted with an aqueous ethanol solution to obtain a crude extract of the maggot, and then three-band simulated moving bed chromatography is used to separate and purify the citrus in the crude extract of the citrus to obtain an extract of the citrus, and then the The extract is concentrated and crystallized to obtain high-purity citrusin. The method can purify citrus glycosides on a large scale and efficiently, and the simulated moving bed chromatographic separation process realizes robust, continuous and automatic operation, and the stationary phase and mobile phase can be used repeatedly, reducing the purification cost.

The invention relates to a polymer purification method and equipment, a solution film-making method and equipment, and a flocculent and granular precipitated polymer. In the dissolution box, raw material cellulose acylate (raw material CA) was dissolved in methylene chloride to prepare a thin stock solution having a polymer concentration of 7% by mass. Filter the thin stock solution through a filter. Hot water heated and kept above the boiling point of dichloromethane was put into the precipitator. Sprinkle the dilute stock solution from the first nozzle toward the hot water surface in the precipitator. Dichloromethane in the dilute stock solution in contact with hot water evaporates, and cellulose acylate is precipitated. This precipitated cellulose acylate (precipitated CA) was taken out from the water surface, and the contained hot water was squeezed. Thereafter, the precipitated cellulose acylate was dried with a vibration dryer. Since the precipitated cellulose acylate is obtained from the dilute stock solution once dissolved in the solvent, the precipitated cellulose acylate excellent in solubility by the solvent can be obtained.

The invention discloses an underbalance drilling method and system for coal bed gas. The method comprises the following steps that an intermediate casing is lowered in, and a gas injecting pipe and a liquid injecting pipe which are communicated with the interior of the intermediate casing are arranged on the outer portion of the intermediate casing; after a destination layer is entered and after underbalance is established through the gas injecting pipe, a drilling pump and a gas pump set working continually; when one single drill pipe or drilling stand column is drilled and the preparation work of drilling a next single drill pipe or drilling stand column is carried out, the drilling pump is used for injecting and switching drilling liquid into the liquid injecting pipe; the preparation work of drilling the next single drill pipe or drilling stand column is completed, and the drilling pump is used for injecting and switching the drilling liquid into a drilling column. According to the underbalance drilling method and system, borehole purification is maintained in the drilling and non-drilling states, the occurrence of sand setting and drilling tool jamming accidents is effectively prevented, and even underbalance well bottom pressure can be maintained continually.

The application discloses a river channel ecological restoration system and restoration method, including a microbial breeding device for breeding microorganisms, an ecological hanging bed for planting plants to purify water, and transporting the microorganisms in the microbial breeding device to the ecological hanging bed. The control pipeline at the root system of the plant; a cultivation space is provided around the bottom of the ecological suspension bed, and the roots of the plants planted in the ecological suspension bed extend downwards into the cultivation space, and the lower side of the cultivation space is open; The output end of the control pipeline is connected to the cultivation space. This application sets up a cultivation space at the root system of the plants planted in the ecological suspension bed, and inputs functional microbial communities into the cultivation space to increase the content of functional microorganisms in the cultivation space, so that the plant root system can be kept in a highly active state, thus through the ecological suspension bed Purification effect on water body.

The invention relates to the field of a sewage treatment system, particularly a no-discharge sewage treatment system which has the advantages of high cleanness, environmental protection and low operating cost. The no-discharge sewage treatment system comprises a pretreatment device, a precise water filtration device and a soil purification device, wherein the pretreatment device comprises a corrosion chamber and a pre-filtration chamber; the pre-filtration chamber is provided with a feed port and a discharge port; the corrosion chamber is communicated with the feed port of the pre-filtration chamber; the pre-filtration chamber is filled with a filter material; the precise water filtration device comprises a water covering tank and a water collection pipe; the water covering tank is provided with a water inlet and a water outlet; the water inlet is communicated with the discharge port of the pre-filtration chamber; the water collection pipe is provided with a water outlet section, designed in a groove structure, and communicated with the water outlet; the soil purification device comprises a soil filtration component and a water distribution fabric; the soil filtration component is composed of air-permeable soil, including volcanic rock ash and / or steelmaking furnace slag; the soil filtration component is arranged on the upper side of the water collection pipe; and one end of the water distribution fabric is arranged in the water covering tank, and the other end is arranged in the soil filtration component.

The invention belongs to the field of sewage treatment, and particularly relates to an immobilized microorganism-plant combined ecological treatment system and application. The system comprises a slow flow settling region and at least one purification region in sequential arrangement, wherein the purification region consists of a broad-crested weir and an immobilized microorganism packing pool; the front part of the broad-crested weir is connected with the slow flow settling region; the back end of the broad-crested weir is connected with the immobilized microorganism packing pool; the width of the slow flow settling region is identical to that of the bottom surface of a riverway; the bottom surface of the slow flow settling region is lower than the river bottom; the broad-crested weir is higher than the river bottom; the bottom surface of the immobilized microorganism packing pool is lower than the river bottom; three layers of packing of immobilized microorganisms are arranged in the immobilized microorganism packing pool; the packing sequentially includes a gradation cobblestone layer, a water supply sludge particle layer and a submerged plant planting region from bottom to top; rich nutritive salt and inorganic salt such as total phosphorus and ammonia nitrogen in a black and odorous water body can be continuously and efficiently removed; various contaminants can be treated; high applicability and continuity are realized; the water pollution treatment cost is reduced.