摘要:
The present invention relates to a process for simulated moving bed (SMB) adsorption and separation with a reduced number of control valves, comprising separating the feedstocks comprising isomers by SMB adsorption, said SMB comprising m beds of adsorbent, each of which is equipped with grids, each of the grids being equipped with the materials charging and discharging pipeline of the bed, the materials charged into and discharged from SMB at least comprising adsorption feedstocks, desorbent, extract, raffinate and the flushing liquids charged from different beds, wherein the to extract is enriched with the target product; there are at least two streams of said flushing liquid selected from any one of the adsorption feedstock, desorbent, extract and raffinate; there are altogether n streams of materials charged to and discharged from the SMB, wherein there are s types of materials having the same composition and flow direction; p sets of on-off valves are used to control n streams of materials is charged to and discharged from the beds of adsorbent, wherein at least one group of materials composed of two streams of materials having the composition and flow direction is controlled by one set of valves, with s≦p
摘要翻译:本发明涉及一种具有减少数量的控制阀的模拟移动床(SMB)吸附和分离方法,包括通过SMB吸附分离包含异构体的原料,所述SMB包括多个吸附剂床,每个床装有栅格 每个网格配备有床的材料充放电管线,至少包含吸附原料,解吸剂,提取物,提余液和从不同床装入的冲洗液体的SMB中排出的材料,其中提取 富含目标产品; 从吸附原料,解吸剂,萃取液和萃余液中的任一种中选出至少两股所述冲洗液; 总共有N条物料流充入和排出SMB,其中有类型的材料具有相同的组成和流动方向; p组开关阀用于控制n个物料流从吸附剂床排出并排出,其中由具有组成和流动方向的两股材料组成的至少一组材料由一组控制 阀门,s≦̸ p
摘要:
The present invention relates to a process for separating isomers by simulated moving bed (SMB) adsorption, comprising separating the raw materials comprising isomers by SMB adsorption, said SMB comprising many adsorption beds each of which is equipped with grids, each of the grids being equipped with the feedstock inlet and outlet pipeline of the bed, the feedstock charged into and discharged from SMB at least comprising feedstocks, desorbent, extract, and raffinate, the extract being enriched with the target product, characterized in that the extract is used as a flushing liquid and respectively charged to first or second bed at the upstream of the feedstock charging position and to one of second to fourth beds at the downstream of the extract withdrawing position. Such process is used for separation of C8 aromatic isomers by adsorption, and can improve the capacity of the device while effectively increasing the purity of the target product separated by adsorption.
摘要:
An agglomerated zeolite adsorbent which comprises 95-99.5 mass % of X zeolite and 0.5-5.0 mass % of binder, wherein the exchangeable cationic sites of said X zeolite are occupied by Group IIA metal and/or K, the total pore volume of said adsorbent is no less than 0.26 mL/g as measured by mercury porosimetry, the volume of pores with pore diameters from 100 to 500 nm is at least 60% based on the total pore volume. During shaping, a pore-forming agent is added to this adsorbent, and then the adsorbent is alkali treated for in-situ crystallization, followed by ion exchange. Said adsorbent has high adsorption capacity, fast mass transfer rate and good mechanical strength. Said adsorbent is suitable for liquid phase adsorptive separation of para-xylene from C8 aromatic hydrocarbons and is also suitable for adsorptive separation of other alkyl aromatic hydrocarbons isomers.
摘要:
An agglomerated zeolite adsorbent which comprises 95-99.5 mass % of X zeolite and 0.5-5.0 mass % of binder, wherein the exchangeable cationic sites of said X zeolite are occupied by Group IIA metal and/or K, the total pore volume of said adsorbent is no less than 0.26 mL/g as measured by mercury porosimetry, the volume of pores with pore diameters from 100 to 500 nm is at least 60% based on the total pore volume. During shaping, a pore-forming agent is added to this adsorbent, and then the adsorbent is alkali treated for in-situ crystallization, followed by ion exchange. Said adsorbent has high adsorption capacity, fast mass transfer rate and good mechanical strength. Said adsorbent is suitable for liquid phase adsorptive separation of para-xylene from C8 aromatic hydrocarbons and is also suitable for adsorptive separation of other alkyl aromatic hydrocarbons isomers.
摘要:
The present invention relates to a process for separating isomers by simulated moving bed (SMB) adsorption, comprising separating the raw materials comprising isomers by SMB adsorption, said SMB comprising many adsorption beds each of which is equipped with grids, each of the grids being equipped with the feedstock inlet and outlet pipeline of the bed, the feedstock charged into and discharged from SMB at least comprising feedstocks, desorbent, extract, and raffinate, the extract being enriched with the target product, characterized in that the extract is used as a flushing liquid and respectively charged to first or second bed at the upstream of the feedstock charging position and to one of second to fourth beds at the downstream of the extract withdrawing position. Such process is used for separation of C8 aromatic isomers by adsorption, and can improve the capacity of the device while effectively increasing the purity of the target product separated by adsorption.