44results about How to "No emission issues" patented technology

The invention discloses a process for recovering a waste polyethylene glycol terephthalate (PET) material. The process is characterized by comprising the following steps of: crushing the waste PET material, dissolving the crushed PET material ion into an organic solvent to form a homogeneous solution; and adding an adsorbent into the homogeneous solution, discoloring and removing insoluble substances, and sequentially filtering and crystallizing to obtain the required crystallized PET material. According to the process for recovering the waste PET material, the recycled polyester intrinsic viscosity control technology, the crystallization technology and the impurity removal technology are realized, water is not required to be added in the whole process, the wastewater discharge is avoided, and the environmental pollution is reduced. The intrinsic viscosity of the recycled PET product reaches 0.77dL/g, the purity is 99.5 percent, and the recovered material reaches a novel level.

The invention provides an ultraviolet-thermal double curing polyaniline anti-corrosive coating and a preparation method thereof. In the coating, polyaniline is adopted as a main anti-corrosive material, and oligomer, a reactive diluent, polyurethane polylol, polyaniline, filler, light trigger and an auxiliary agent are used for preparing filtrate of the coating; and the filtrate and a polyurethane curing agent are stored respectively and uniformly mixed in proportion for use. The anti-corrosive paint has good anti-corrosive effect on different metals, not only can perform ultraviolet curing crosslinking but also can perform thermal curing crosslinking, well overcomes the defect of incomplete curing of an ultraviolet curing anti-corrosive paint, has the characteristics of resisting acid medium corrosion and alkali medium corrosion, is suitable to be used under the condition of a severe environment and particularly suitable for corrosion protection under the condition of a marine environment, does not contain heavy metals such as plumbum, chromium and zinc, and simultaneously does not contain any organic solvent in a formula. Therefore, the coating does not have the problem of environmental pollution during the production process and the use process, and is a completely environment-friendly coating.

The invention relates to a waterless dyeing method of dispersed dye, comprising: (1) taking an ionic liquid as a solvent where the dispersed dye is dissolved; (2) dyeing dacron according to an ionic liquid impregnating method and an ionic liquid hot melt pad dyeing method; and (3) recycling the ionic liquid and the dye by an alcohol or water distillation circulation method. The dyeing method and a formula are simple, and the operation is convenient; during dye bath, since no dyeing auxiliaries such as a dispersing agent and a high temperature leveling agent are needed, the problems of dyeing waste water caused by the dyeing auxiliaries themselves and the toxicity of a carrier are solved; and in addition, the ionic liquid in the residual dyeing liquid and the dye can be recycled.

The invention discloses a double side coated solvent-free polyurethane laminating adhesive, which comprises a component A and a component B, wherein the component B is prepared from one or a mixture of any two or above of polylol a of which the carbon chain length is C12 or below, polylol b with at least two degrees of functionality and above, vegetable oil modified polylol c, epoxy resin, acrylic resin and silicane resin, and a curing speed regulator d; besides being prepared from these ingredients, the component A is also prepared from a polyurethane prepolymer generated by the reaction of aromatic and/or aliphatic and/or alicyclic diisocyanate. The invention also discloses a preparation method, a coating process and application of the double side coated solvent-free polyurethane laminating adhesive. The problem that an existing solvent-free laminating adhesive needs to be previously mixed before being coated is solved.

The invention discloses a process for recovering a waste polycarbonate (PC) material. The process is characterized by comprising the following steps of: crushing the waste PC material, dissolving the crushed PC material ion into an organic solvent to form a homogeneous solution; and adding an adsorbent into the homogeneous solution, discoloring and removing insoluble substances, and sequentially filtering and crystallizing to obtain the required crystallized PC material. According to the process for recovering the waste PC material, the recycled polyester intrinsic viscosity control technology, the crystallization technology and the impurity removal technology are realized, water is not required to be added in the whole process, the wastewater discharge is avoided, and the environmental pollution is reduced. The intrinsic viscosity of the recycled PC product reaches 0.77dL/g, the purity is 99.5 percent, and the recovered material reaches a novel level.

The invention relates to a system for industrial waste gas treatment and salt regeneration, which comprises a waste gas treatment device, a neutralization deslagging device, a salt liquid concentration device, a main water supply pipe, an alkali liquid feeding tank and a hydrochloric acid storage tank, wherein the waste gas treatment device is provided with absorption towers No.1-No.5, a gas-liquid separator, a blender, an acid liquid clarifying tank and an alkali liquid transit tank; the neutralization deslagging device is provided with a neutralization mixing kettle, an impurity elimination tank, a filter press and a salt liquid transit tank; and the salt liquid concentration device is provided with a preheater, a heater, an evaporator, a crystallizer, a salt liquid mixing tank, a centrifuge, a condenser and a condensing water tank. The system can effectively treat industrial waste gas containing chlorine gas and hydrogen chloride gas. Since products are reclaimed from waste liquid, the added value of the system is improved, and simultaneously, problems on sewage discharge do not exist.

The invention relates to the field of novel electrothermal mateirals, and specifically relates to a graphene water-borne electrothermal film coating and a preparation method thereof. The coating comprises the following components: 40-60wt% of water-borne resin, 3-15wt% of nano graphene, 0.5-2.5wt% of mixture of calcium sulfate whisker and hydrogenated castor oil, 0.5-1.5wt% of polyaniline, 0.5-1.5wt% of polythiophene, 0.5-1.5wt% of a flatting agent, 0.5-1.5wt% of a defoaming agent, and 30-40wt% of water, totalling 100%. According to the coating, the mixture of calcium sulfate whisker and hydrogenated castor oil is added, so that the nano graphene can be prevented from agglomeration in the solution, and moreover, the defects of poor lapping of graphene laminates and incomplete power conducting and heat transferring network can be avoided, and as a result, the power conducting performance and the heating performance of the product can be improved.

The invention discloses a soil conditioning agent and a preparation method thereof. The soil conditioning agent comprises the following main components in percentage by weight: 90 to 96% of polyacrylamide (PAM), 1 to 3% of water soluble organic carbon (SOC), 2 to 4% of polyaspartic acid, and 1 to 3% of polyglutamic acid; the polyacrylamide (PAM) is water-in-water type anionic polyacrylamide emulsion, the molecular weight of PAM is 10,000,000 to 20,000,000, the solid content is 35 to 45%; and the water soluble organic carbon (SOC) is prepared from residues of plants. The provided soil conditioning agent can improve the physical and chemical structure of soil, increase the content of aggregates and organic matters in the soil, and enhance the water and fertilizer retaining performance of soil. Moreover, the preparation technology is simple, the production cost is low, the dissolution speed is quick, and the soil conditioning agent can be evenly applied.

The invention discloses a metal stearate preparation method. The method comprises the following steps: stirring stearic acid, sodium hydroxide, calcium carbonate and medium water at a temperature below the melting point of stearic acid under normal pressure for mixing, heating to a temperature 60-70DEG C higher than the melting point of stearic acid in order to carry out a reaction, carrying out dehydration drying on the above obtained product, dispersing, and drying to metal stearate. The preparation method has the following advantages: 1, the reaction is carried out in the water medium with a low temperature under normal pressure, so a simple routine double decomposition process production apparatus can be used, and the color of the finally obtained product is excellent; and 2, no byproducts are generated in the reaction, and no additives are used in the reaction, so the purity of the product is high, a wastewater emission problem does not exist, and the medium water and waste heat can be recovered and reused.

The invention relates to a system and a method for preparing erythritol and polydextrose from corn starch. The system comprises a size mixing tank, a liquefying tank, a saccharifying tank, a filter, a first ion exchange system, a nanofiltration unit, a high-temperature polycondensation unit and a fermentation and crystallization unit. Corn starch is used as a raw material, glucose liquid is obtained after liquefaction and saccharification treatment, permeate containing high-concentration glucose and trapped fluid containing low-concentration glucose are obtained after treatment of a nanofiltration unit, the high-purity glucose liquid is used for preparing erythritol through fermentation, and the low-purity glucose liquid is used for preparing polydextrose. According to the method, two high-value products, namely erythritol and polydextrose, can be prepared at the same time, meanwhile, the problem of mother liquor discharge does not exist, the mother liquor treatment cost is reduced, and high-value utilization of low-purity glucose liquid is achieved to the maximum extent.

The invention relates to a metro tunnel ash cleaning device, belonging to the technical field of environmental protection of urban metro tunnels. Under the dispatching arrangement of the metro operation company, the plane jet type metro tunnel blowing device is quickly pulled from the blowing device parking place to the metro tunnel which has blowing and ash cleaning needs by a railway diesel locomotive, and the blowing and ash cleaning operation is carried out on the metro tunnel at a relatively low running speed. The plane jet type metro tunnel blowing device is mainly characterized in thata blowing nozzle (13) is arranged at the periphery of a pressure stabilizing box (8) and is close to the boundary of the metro vehicle, and the dust on the inner wall of the metro tunnel and adhered to various facilities is blown in a plane jet mode. The outer edge of an air suction port (9) is close to the metro vehicle gauge, and sucks the plane jet air discharged from the blowing nozzle (13) into a dust removing device (12) together with the raised dust, so that the dust is filtered down and the clean air is returned to the metro tunnel.