41results about How to "Long penetration time" patented technology

The invention discloses a method for modifying an activated carbon fiber filter screen for removing formaldehyde with a relatively high concentration in the air and its product and application, including activated carbon fiber filter screen pretreatment, activated carbon fiber filter screen ozone surface strong oxidation treatment, drying treatment, filtration Ammonium sulfate modification treatment and drying treatment, the obtained activated carbon fiber filter was laid flat, and dried in an oven at 110° C. for 24 hours to obtain the desired product. The preparation process of the present invention is simple, and the prepared modified activated carbon fiber filter screen has a concentration of formaldehyde of 15 mg / m 3 When the removal rate reaches 100%, and can last for a long time.

A refrigeration assisted adsorption type VOCs (volatile organic compounds) recovery device and recovery method belongs to the fields of energy utilization, resource recovery, environmental protection and the like. The device comprises a coarse filtration unit, a cooling unit, an absorption device, a fan, a vacuum pump and a branch diversion channel which are sequentially connected. The method comprises steps of coarse filtration, cooling for vapour removal and gas mixture cooling, adsorption, heating assisted vacuum desorption, cooling capacity recovery, exhausting and the like sequentially. The cooling unit comprises an evaporator, a compressor, a forced air cooling condenser, a liquid storage tank, a throttle valve and the like. The cooling unit is used for removing vapour in a gas mixture, and reducing the temperature of the gas mixture, so as to remarkably improve the subsequent absorption effect and prolong the service cycle of the absorption device. The recovery device is high in recovery efficiency, relatively low in cost, simple in structure, long in service life, and easy to control and operate, and is particularly suitable for recovery processing of low concentration VOCs, which are not suitable for condensation methods, in chemical engineering, automobile industry and other fields.

The invention relates to a molecular sieve ceramic membrane material for olefin purification as well as a preparation method and application of the molecular sieve ceramic membrane material. In the molecular sieve ceramic membrane material, the particle sizes of molecular sieve particles supported on the surface of the ceramic material are 0.1-3 [mu]m, and the thickness of a molecular sieve layeris 3-5 [mu]m; during preparation, ceramic material pretreatment, molecular sieve seed crystal pre-coating and sealed crystallization are sequentially carried out; and the molecular sieve ceramic membrane material is used for removing a polar oxygenated compound in a gaseous olefin flow to be 1ppm or below. Compared with the prior art, the molecular sieve ceramic membrane material prepared by the preparation method of the invention has the molecular sieve layer with higher mechanical strength, larger specific surface area and uniform thickness, in addition, the molecular sieve layer has no longitudinal or horizontal cracks, has no air pores in the surface and is high in bonding strength and not easy to fall off; and when the polar oxygenated compound in the olefin flow is adsorbed, the purification depth is 1ppm or smaller, so that not only is the mass transfer resistance lower, but also the energy consumption is lower, and the regeneration capacity is high.

The invention discloses a material for deep removal of ammonia nitrogen from water, and a preparation method and an application method of the material. The preparation method comprises the following steps: adopting natural zeolite powder as a main raw material, adding a binder and a foaming agent, proportioning above materials, mixing all the materials, molding the obtained mixture, cutting the molded mixture, and carrying out autoclaved curing to obtain the zeolite aerated concrete particle material with the particle size of 10-30mm, small apparent density and high open porosity. The material can selectively adsorb ammonia nitrogen in water, and is a high-efficiency microbial carrier material; and a nitrogen removal treatment tank is filled with the material, and then adsorption, water emptying, blasting oxygen introduction and water leaching are sequentially carried out to make the concentration of ammonia nitrogen in water be smaller than 1.5 mg / L.

The invention provides a composite molecular sieve, a desulfurization adsorbent, a preparation method and application thereof. The preparation method of the composite molecular sieve comprises: adding the template agent for preparing the mesoporous molecular sieve into the alkali solution, and stirring to obtain a clear solution; The source is added into the suspension to carry out stirring reaction, and after the reaction, it is filtered, dried and calcined to obtain a composite molecular sieve. The raw material composition for preparing the desulfurization adsorbent includes: 30-70 parts of composite molecular sieve, 1-10 parts of Group IA and / or Group IIA metal oxygen compound precursor and 30-60 parts of binder. The desulfurization adsorbent of the present invention has high adsorption capacity, good selection, high desulfurization precision, can be recycled and utilized, and has a long service life; the desulfurized carbon five oil can be directly used as a raw material for high-value utilization by using the desulfurization adsorbent.