9 results about "Material flow" patented technology

The invention discloses a method for separating low-carbon olefin gas. The method is used for overcoming the disadvantages in existing low-carbon olefin separation methods that cryogenic separation is complicated in process flow, large in investment and the like. The method comprises the following steps: the low-carbon olefin gas enters a deethanization tower after the low-carbon olefin gas is compressed and dried, a tower bottom material flow of the deethanization tower is conveyed to a depropanization and propylene distillation system so as to separate polymer-grade propylene products, and a tower top material flow of the deethanization tower enters a demethanization tower; and a tower bottom material flow of the demethanization tower is conveyed to an acetylene converter and an ethylene distillation tower, a tower top material flow of the demethanization tower is conveyed to an absorption tower and is in contact with an absorbent, a tower top gaseous-phase material flow of the absorption tower is output or enters a fuel gas system, and a tower bottom material flow of the absorption tower is conveyed to the deethanization tower. The method disclosed by the invention has the advantage that the cryogenic separation is simple in process flow and small in investment and can be used for producing target products, such as polymer-grade ethylene, polymer-grade propylene and the like.

The invention discloses a separation method used for preparing isopropanol via hydrogenation of acetone. According to the separation method, an acetone hydrogenation product is subjected to azeotropic distillation and extractive distillation so as to obtain high-purity isopropanol. The separation method comprises following steps: (1) the acetone hydrogenation product is delivered into a rectifying tower for azeotropic distillation, an azeotrope is collected from the top of the rectifying tower, a heavier component is collected from a tower kettle of the rectifying tower, and an isopropanol product is collected from side lines of a tower body of the rectifying tower; (2) the azeotrope collected from the top of the rectifying tower is delivered into a recovery tower, and is subjected to extractive distillation using an extraction agent, a material flow containing acetone and isopropanol is collected from the top of the recovery tower, and is delivered back to a reactor for recycling, and an aqueous solution rich in the extraction agent is collected from a tower kettle of the recovery tower; and (3) the aqueous solution rich in the extraction agent is delivered into a dehydrating tower, and the extraction is collected from a tower kettle of the dehydrating tower, and is delivered back to the recovery tower. According to the separation method, azeotropic distillation and extractive distillation are adopted, high-purity isopropanol is prepared, raw material consumption is less, extraction agent loss is low, technical processes are simple, and operation is convenient.

The invention discloses a tubular film evaporator for polyester production, comprising a shell which is provided with a feed inlet and a vacuum extract opening at the top. A feed outlet is arranged at the bottom of the shell. At least a group of evaporation units is arranged below the feed inlet inside the shell, and each group of evaporation units comprises a material receiving funnel and a heat exchange tube. The heat exchange tube is arranged perpendicularly and inserted in the circular hole at the bottom of the material receiving funnel. A circular gap is retained between the periphery of the heat exchange tube and the material receiving funnel. During polyester production, materials flows downwards from the circular gap retained between the periphery of the heat exchange tube and flows downwards in a film shape along the surface of the heat exchange tube and meanwhile, heat exchange occurs between the materials and the heat exchange tube, and the byproducts generated by the reaction overflow continuously and are extracted by a vacuum pump. Because the materials are distributed outside the heat exchange tube, the problem of blockage is solved. The tubular film evaporator has the advantages of good film forming effect, reliable use and high work efficiency and can be used in production of polymers of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylece terephthalate (PBT), PTT and the like.

The invention relates to a device for segregating unwanted items (1) from a stream of bulk material, wherein the device has at least one inlet opening (3) for the bulk material (4), which can be connected to a bulk material feed (2), a segregating unit (5), which is arranged downstream of the inlet opening (3) in a transporting direction (F) of the stream of bulk material, and also at least one outlet (6) for the bulk material (4) freed of unwanted items (1) with the aid of the segregating unit (5), arranged downstream of the segregating unit (5) in said transporting direction (F). It is proposed according to the invention that the segregating unit (5) has at least two transporting channels (7) arranged in parallel and branching away from the inlet opening (3), wherein the transporting channels (7) can respectively be passed by a partial stream of bulk material branching off from the stream of bulk material flowing in by way of the inlet opening (3), and wherein each of the transporting channels (7) is assigned at least one detector (8) for the detection of unwanted items (1) and a separating device (9), with the aid of which the partial stream of bulk material passing the respective transporting channel (7) can be diverted into a system of disposal channels (10). A description is also given of a method for segregating unwanted items (1) from a stream of bulk material with the aid of a segregating unit (5), which is distinguished by the fact that the stream of bulk material is divided into at least two partial streams of bulk material before or within the segregating unit (5), wherein each partial stream of bulk material is monitored individually with regard to the presence of unwanted items (1) with the aid of a separate detector (8) of the detector arrangement (18), and wherein only the partial stream of bulk material that has an unwanted item (1) is diverted into a system of disposal channels (10).

The invention unfurls a kind of separation equipment. In the shell is film separating unit tube, in front of the tube is the material of self cleaning and the equipment of the material to be separated. In the tube there is the entrance equipment of the liquid to be separated, and the flowing tube to make the liquid out and the bottom equipment to make the self material out. The liquid and the self cleaning material flow out from the flowing tube, permeating liquid goes into the film, and then goes out from the exit. Self cleaning material can move spirally along the surface of the separating film, cleaning the surface of the film continually. The invention has the advantages of proper construction, simple operation, and high effect to separate, so it can be used in industry, people and military.

The invention relates to a method for recovering acrylic acid in wastewater. The method comprises the following steps: S1, sending a liquid-phase first material flow to a light-component fractionatingtower for distilling to obtain a gas-phase second material flow and a liquid-phase third material flow; S2, sending the third material flow to an acetic acid removing tower for distillation to obtaina gas-phase fourth material flow and a liquid-phase fifth material flow; S3, the fifth material flow is sent to an acrylic acid purification tower for distillation to obtain a gas-phase sixth material flow and a liquid-phase seventh material flow, condensing the sixth material flow at the top of the acrylic acid purification tower and obtaining two product parts through separation, sending one product part back to the acrylic acid purification tower, and the other product part to a finished product tank; and S4, sending the seventh material flow to an acrylic acid stripping tower for distillation to obtain a gas-phase eighth material flow and a liquid-phase ninth material flow, sending the eighth material flow to the light-component fractionating tower, and sending the ninth material flowto the outside. According to the method, acrylic acid in the wastewater is recycled, and the utilization rate of raw materials is increased.

The invention relates to the field of sampling devices for coal quality detection at the belt head and discloses a sampling and sample preparation device for the belt head. The device comprises a sampling mechanism, two sample preparation mechanisms, a return sample mechanism and a frame, wherein the two sample preparation mechanisms are located on both sides of the belt head; the sampling mechanism is matched with a first sample preparation mechanism and a second sample preparation mechanism so that the sampling mechanism can move from the first sample preparation mechanism to the second sample preparation mechanism to intercept a material and place the material in the sample preparation mechanism and can also move from the second sample preparation mechanism to the first sample preparation mechanism to intercept the material and place the material in the sample preparation mechanism. Materials falling in a hopper at all the material flow positions are more uniform in quantity by means of improvement of the sampling and sample preparation device for the belt head, so that the sampling is more representative.

The invention relates to a method for reducing energy consumption of an oxidation unit of an epoxy propane device and mainly solves the problem of high energy consumption in the prior art. The method comprises the following steps: a raw material of isopropyl benzene enters an oxidation tower to be in contact with air for oxidation reaction to generate a material flow comprising cumyl hydroperoxide; one part of a liquid phase material flow at the top of the oxidation tower passes through a cooler and then directly returns back to the bottom of the oxidation tower through a circulation pipeline, and the other part of the liquid phase material flow enters the next level of oxidation tower or the next section; wherein a circulating pump is not arranged on the circulation pipeline, but natural circulation is realized through the density difference of gas-liquid phase material flows in the oxidation tower and the liquid phase material flow in the circulation pipeline. The method can be used in epoxy propane production.