Abstract:
PROBLEM TO BE SOLVED: To provide a process and an apparatus for producing high-purity (i.e. higher than 99.7%) para-xylene with an amount equal to that produced in a conventional apparatus by using an adsorbent with a volume less than that in the conventional apparatus.SOLUTION: In a process for separating xylene by simulated counter-current (SCC), two absorbers connected in series with a total number Nt of beds of 22 or fewer are used and operated under a predetermined operation condition (temperature, pressure, flow ratio, recirculation ratio, circulation time, average linear velocity, and moisture content). In the process of the invention, there are a case in which the process is conducted by using a new apparatus and another case in which the process is conducted by remodeling an existing apparatus.
Abstract:
PROBLEM TO BE SOLVED: To provide an adsorption/separation method using a solid containing zeolite having a specific structure of an IM-12 structure as an adsorbent mass.SOLUTION: The method for adsorbing/separating a certain molecular species from a mixture containing the certain molecular species and other molecular species by optional ratios includes a step of bringing the mixture into contact with a solid absorbent. The solid adsorbent contains the solid having the crystalline structure of IM-12 and the chemical composition shown by chemical formula: XO:mYO:pZO:qR/nO (wherein R is one or more n-valent cations; X is one or more tetravalent elements except germanium; Y is germanium; and Z is at least one trivalent element) as the anhydride base by molar ratios of oxides.
Abstract:
PROBLEM TO BE SOLVED: To improve purity, a paraxylene yield, and productivity very significantly in relation to the prior art.SOLUTION: This invention relates to a process for the separation of paraxylene by simulated counter-current (SCC) chromatography from a feed stock (F) essentially comprising paraxylene and its aromatic C8 isomers, wherein the process is carried out in an adsorber and is characterized in that it has a cumulated height (Hcu) of adsorbent solid in relation to the whole of the adsorbers of between 6 and 21 m and the mean superficial velocity (Vsl) over each adsorber is between 1 and 2 cm/s.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for selectively hydrogenating gasoline including a polyunsaturated compound and a sulfurous light compound.SOLUTION: A method conjointly allows hydrogenation of polyunsaturated compounds into monounsaturated compounds, increase in weight of sulfurous light compounds by the reaction with unsaturated compounds, and maximization of isomerization of monounsaturated compounds including an external C=C double bond into the internal C=C double bond isomer thereof. The method is carried out using a catalyst containing a group VIb metal and a group VIII metal on a porous carrier, wherein the weight contents of the group VIb element and the group VIII element relative to the weight of the catalyst are 6-18% and 4-12% as oxides respectively, specific surface area of the catalyst is 200-270 m/g, and density of the group VIb element (represented by the ratio of the weight content of the oxide of the group VIb element to the specific surface area of the catalyst) is 4×10to 6×10g/m, and a molar ratio of the group VIII metal to the group VIb metal is 0.6-3 mol/mol.
Abstract:
PROBLEM TO BE SOLVED: To provide a flexible process and an apparatus for the simulated conter-current production of para-xylene.SOLUTION: Two adsorbers can be connected in different three modes according to a flow rate of a supplied raw material to be treated and the presence or absence of an maintenance operation oif the one adsorber, in the case of functioning in "high productivity" mode each adsorber has 12 floors (the absorber (a)) has floors L1a to L12a and the absorber (b) has floors L1b to L12b). The two adsorber are separated execute two cycles of cycles comprising 12 steps in parallel. An injection opening Fa (the adsorber (a)) and an injection opening Fb (the adsorber (a)) of the supplied raw material flow, an injection opening Da (the adsorber (a)) and an injection opening Db (the adsorber (b)) of a desorbent flow, a drawing out opening Ea (the adsorber (a)) and a drawing out opening Eb (the adsorber (b)) of an extract flow, a drawing out opening Ra (the adsorber (a)) and the drawing out opening Rb (the adsorber (b) of a raffinate flow are formed in the respective adsorbers.
Abstract:
PROBLEM TO BE SOLVED: To solve the problem of limitation to productivity of 24-bed para-xylene production devices without disadvantages of the prior art solutions using two adsorbers, which are connected together in parallel and each have 12 beds, for directly producing high purity para-xylene (i.e., more than 99.7% purity).SOLUTION: A process for simulated counter-current separation of xylenes includes a first adsorption step using two adsorbers each having twelve beds. Each of the adsorbers has a line for introducing a feed (F), a line for introducing an eluent (D), a line for withdrawing an extract (E), and a line for withdrawing a raffinate (R); and is divided into 4 chromatographic zones.
Abstract:
PROBLEM TO BE SOLVED: To provide a pseudo-moving bed separation method with improved separation efficiency. SOLUTION: The pseudo-moving bed separation method is a separation method of a feed F by pseudo-moving bed adsorption in an SMB equipment and the equipment comprises outside bypass lines L i/i+1 for directly bonding two continuous plates P i and P i+1 , each (suffix i is an even number or an odd number (exclusive of the former)) along the entire length of a column for flushing the plates and each bypass line L i/i+1 has an automated means for controlling the flow rate in the bypass line. With respect to the opening degree of the control means, three rules are regulated as follows: (a) the flow rate is established corresponding to over synchronicity in a range of 15 to 30% in the entire opened bypass line in a zone 1; (b) the flow rate is established corresponding to synchronicity in a range of ±8% in the entire opened bypass line in zones 2 and 3; and (c) the flow rate is established corresponding to over synchronicity in a range of 20 to 40% in the opened bypass line in a zone 4. COPYRIGHT: (C)2011,JPO&INPIT
Abstract translation:要解决的问题:提供具有提高的分离效率的伪移动床分离方法。 解决方案:伪移动床分离方法是在SMB设备中通过伪移动床吸附进料F的分离方法,并且设备包括外部旁路管线L i / i + 1 SB> 用于直接连接两个连续板P i SB>和P i + 1 SB>,每个(后缀i是偶数或奇数(不包括前者))沿着整个 用于冲洗板和每个旁通管线L的柱的长度具有用于控制旁路管线中的流速的自动化装置。 关于控制装置的开度,三个规则被调节如下:(a)在区域1中的整个开启的旁路管线中,对应于15-30%的过度同步性建立流量; (b)在区域2和3中的整个开启的旁路管线中,对应于±8%的范围内的同步性建立流量; 和(c)在区域4的开通旁路管线中,对应于20〜40%范围内的过度同步性确定流量。(C)版权所有(C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a new method of analysis for on-line concentration measurement of flow composition in hydrocarbon traveling within various separated bands of the simulated moving bed based on simultaneous measurement of Raman spectrum and temperature for a sample in the measuring point. SOLUTION: This invention is the method using an immersion probe and a thermocouple to measure concentration of a form existed in one point of a separator which functions in a manner of the simulated moving bed (SMB). The immersion probe is located in one of the flows entering or coming from one point inside the above separator or the separator itself, while the thermocouple is located near the immersion probe. Further the Raman spectrum obtained by using a laser light source which functions in wavelength of 785 nm is also used. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To construct a method for producing meta-xylene of a purity of at least 99.5% by combining a simulated moving-bed adsorption step and a crystallization step to separate the meta-xylene. SOLUTION: The simulated moving-bed adsorption step (LM3) is operated under a mild condition and the purity of the meta-xylene discharged from the adsorbing apparatus is low, generally 75% to 99%. The apparatus has high productivity (amount of meta-xylene produced per unit volume of an adsorbent per unit time) and a raw material is rich in ortho-xylene (for example, 10% or higher) which lead to a decrease of the ratio of a solvent to the raw material. The yield in the crystallization (CD6, CD12) step is improved by concentrating the coming raw material in advance. COPYRIGHT: (C)2009,JPO&INPIT