33results about How to "Reduce membrane area" patented technology

A spiral separation membrane element effective in reducing the pressure loss around core tube perforated parts, which is problematic especially in low-pressure operations. The spiral separation membrane element comprises a perforated cored tube 5 and, spirally wound therearound, separation membranes 1, feed-side passage materials 2, and permeation-side passage materials 4, the separation membranes 1 and the passage materials 2 and 4 being wound around the cored tube 5 so that the feed-side passage materials 2 and the permeation-side passage materials 4 are disposed respectively on the feed side and permeation side of the separation membranes 1 and that a permeation-side passage material 10 which is the same as or different from the permeation-side passage materials 4 is interposed at the periphery of the perforated cored tube 5, wherein the effective perforated-part area as calculated by multiplying the total area of the perforated parts in the core tube 5 by the percentage of openings of one layer of the permeation-side passage material surrounding the core tube 5 is at least 1.0 time the inner cross-sectional area of the core tube 5.

A filtration apparatus for performing solid-liquid separation by immersing a plurality of hollow fiber membranes in a to-be-treated liquid containing a suspended component includes the hollow fiber membranes folded double, a treated liquid collection means communicated with an open end of each of the hollow fiber membranes, a holding member for holding a bent portion of each of the hollow fiber membranes with a gap formed between the bent portion and the holding member, and a gas-jetting means for jetting a cleaning gas from the bent side of each of the hollow fiber membranes to a side of the open end. A gap for flowing the gas jetted by the gas-jetting means is formed between the hollow fiber membranes and the holding member or/and in at least one part of gaps between the hollow fiber membranes.

A pressure sensor (30) for harsh environments such as vehicle tires, formed from a chamber (58) partially defined by a flexible membrane (50), the chamber (58) containing a fluid at a reference pressure. In use, the flexible membrane (50) deflects from any pressure difference between the reference pressure and the fluid pressure. The membrane (50) being at least partially formed from conductive material so that associated circuitry (34) converts the deflection of the flexible membrane (50) into an output signal indicative of the fluid pressure. The flexible membrane is less than 3 microns thick to allow the use of a high yield strength membrane material. A thinner membrane also allows the area of the membrane to be reduced. Reducing the area of the membrane reduces the power consumption and the overall size of the sensor. A high yield strength material is better able to withstand the extreme conditions within the tire and a compact design can be installed in restricted spaces such as the valve stem.

The invention relates to a membrane pipe module, said module comprising a cylindrical housing containing a plurality of tubular membrane sections which extend in the axial direction and are interconnected at the ends thereof, forming longer tubular membrane sections. Said cylindrical housing comprises a heatable chamber, on one or both sides, comprising U-shaped connection pipes which are arranged therein and are guided through a separating wall between the chamber and the housing, with the two open ends thereof, and respectively connect two adjacent open tubular membrane sections, forming a membrane loop.

The invention relates to a process and device for recycling dimethyl carbonate through a steam permeation method. The process comprises the specific steps that some byproducts are removed after a reaction solution is subjected to primary distillation, and a methanol-dimethyl carbonate azeotrope enters an extractive distillation tower from the middle and makes contact with spraying water on the top of the tower for extractive separation; methyl alcohol is separated out of liquid at the bottom of the extractive tower through a steam permeable membrane, water and trace dimethyl carbonate are retuned to the top of the extractive tower after being subjected to heat exchange, distillate on the top of the extractive tower is separated through a separator, the water layer at the bottom of the separator returns to the extractive tower, the organic matter layer on the upper portion of the separator is further heated to enter the steam permeable membrane, high-concentration dimethyl carbonate is separated out through the separator, the dimethyl carbonate enters a dimethyl carbonate storage pot after being condensed through a condenser, and permeable water returns to the top of the tower after being subjected to heat exchange. The process and device have the advantages that the technological process is simple, the safety coefficient is high, equipment investment is low, the energy utilization rate is high, and the recycling rate is high.

The present invention provides a method of synthesizing the vitamin C (V _C ) through the esterification, the pervaporation (PV) membrane separation and integration technology, comprising the process of the methyl esterification between the methanol and the 2-ketone-L-gulonic acid (2-KLG) to produce the 2-ketone-L-gulonic methyl ester (2-Me-KLG). The process comprises the following steps: (1) the solid or liquid 2-KLG is dissolved in the methanol; the temperature is then raised and the catalyst is added; (2) the reaction solution prepared in the first step is pumped into the PV membrane separation device; the reaction solution after the membrane dehydration circulates into the esterification reactor; (3) the product 2-Me-KLG or the reaction solution is directly provided for the later production of the V_C. In the method of the present invention, the area of the used membrane is small; the ratio between the alcohol and acid of the raw material liquid and the reaction temperature are relatively low; the invention greatly improves the purity and collection rate of the 2-Me-KLG; the technology is simple and the process is stable; the present invention is suitable for the industrial production-line.

In a gas separation system, a retentate gas discharge port of a first unit U1 and a gas inlet port of a second unit U2 are connected by a retentate gas discharge line. A permeate gas discharge port of U1 and a gas inlet port of a third unit U3 are connected by a permeate gas discharge line. A feed gas mixture supply line is connected to a gas inlet port of U1. A permeate gas discharge port of U2 and the feed gas mixture supply line are connected by a permeate gas return line. A retentate gas discharge port of U3 and the feed gas mixture supply line are connected by a retentate gas return line. At least in operation, the gas permeability of U2 is higher than that of U3, and the gas selectivity of U3 is higher than that of U2.

The invention discloses a preparation method and an application of an acid-resistant PSQ composite membrane, and belongs to the technical field of membrane separation preparation. The preparation method comprises the following steps: (1) dissolving a PSQ precursor in an alcohol solvent, sequentially adding hydrochloric acid, ammonia water and hydrochloric acid, and carrying out an acid-base-acid alternate catalytic reaction to obtain PSQ sol; (2) coating a ceramic support body with a silicon dioxide-zirconium oxide sol to generate a transition layer; and (3) coating the surface of the transition layer with the PSQ sol to serve as a separation layer, and dipping-pulling to prepare the PSQ composite membrane with a supporting layer, the transition layer and a separation layer structure . ThePSQ composite membrane provided by the invention has good acid resistance, high flux and high selectivity, meets the current industrial requirements and expectations, and is widely applied to organicsolvent dehydration and organic solvent separation of an acidic system.