Chromatographic simulated mobile bed separation process with dead volume
correction using an increase in flow rate
    1.
    发明授权
    Chromatographic simulated mobile bed separation process with dead volume correction using an increase in flow rate 失效
    色谱模拟移动床分离过程与死体积校正使用流量增加

    公开(公告)号:US5582736A

    公开(公告)日:1996-12-10

    申请号:US494562

    申请日:1995-06-22

    CPC classification number: B01D15/1828 B01D15/40 B01D2215/025

    Abstract: In a simulated mobile bed separation process, perturbations are corrected in the compositions of an extract (EA) or raffinate (RB) due to the dead volume introduced by at least one recycling pump (P) or compressor for a liquid, supercritical or gaseous mixture in a closed circuit of columns. The process is characterized in that each time an extract extraction stream (EA) or that of the raffinate (RB) passes from a position immediately anterior to a position immediately posterior to each of the dead volumes in the circuit, the flow rate of the flow rate regulated recycling pump or compressor is increased for the time which the extract or raffinate remains in the position immediately posterior to the dead volume When the extract or raffinate extraction stream passes from the immediately posterior position to the dead volume to the following position, the flow rate of the recycling pump or compressor is reduced so that the flow rate regains the value which would have been applied if the dead volume had been ignored.The invention is applicable to the separation of aromatic hydrocarbons containing 8 carbon atoms.

    Abstract translation: 在模拟的移动床分离过程中,由于由用于液体,超临界或气体混合物的至少一个循环泵(P)或压缩机引入的死体积,在萃取物(EA)或萃余液(RB)的组成中校正扰动 在列的闭路中。 该方法的特征在于,每次提取物萃取流(EA)或萃余液(RB)的每一次从紧邻回路中每个死体积的位置之前的位置通过时,流量的流速 提取液或提余液保留在死体积之后的位置的时间内增加了速率调节回收泵或压缩机。当提取物或萃余液萃取物流从紧邻后位置传递至死体积至下一位置时,流量 回收泵或压缩机的速率降低,使得流量恢复如果死体积被忽略的将被应用的值。 本发明适用于分离含有8个碳原子的芳烃。

    Chromatographic simulated mobile bed separation process with dead volume
correction using length reduction
    3.
    发明授权
    Chromatographic simulated mobile bed separation process with dead volume correction using length reduction 失效
    色谱模拟移动床分离过程与死体积校正使用长度减少

    公开(公告)号:US5578216A

    公开(公告)日:1996-11-26

    申请号:US494568

    申请日:1995-06-22

    CPC classification number: B01D15/1828 B01D15/40 B01D2215/025

    Abstract: In a simulated mobile bed separation process, perturbations are corrected in the compositions of an extract (EA) or raffinate (RB) due to the dead volume introduced by at least one recycling pump (P) or compressor for a liquid, supercritical or gaseous mixture in a closed circuit of column sections. The volume of the section immediately upstream of the dead volume is reduced by an appropriate value when said dead volume is located downstream of this section and upstream of the extraction streams of said section, or the volume of the section immediately downstream of the dead volume is reduced by an appropriate value when the dead volume is located downstream of the injection streams into said section and upstream of this section.The invention is applicable to the separation of isomers of aromatic hydrocarbons containing 8 carbon atoms.

    Abstract translation: 在模拟的移动床分离过程中,由于由用于液体,超临界或气体混合物的至少一个循环泵(P)或压缩机引入的死体积,在萃取物(EA)或萃余液(RB)的组成中校正扰动 在柱段的闭合回路中。 当死体积位于该部分的下游和所述部分的提取物流的上游时,紧死死体积上游的部分的体积减小适当的值,或紧靠死体积下游的部分的体积为 当死体积位于注入流的下游进入所述部分和该部分的上游时,减小适当的值。 本发明适用于分离含有8个碳原子的芳烃的异构体。

    Process for regulating at least one fluid flow circulating in a
simulated moving bed chromatographic separation loop
    5.
    发明授权
    Process for regulating at least one fluid flow circulating in a simulated moving bed chromatographic separation loop 失效
    用于调节在模拟移动床色谱分离回路中循环的至少一种流体流的方法

    公开(公告)号:US5685992A

    公开(公告)日:1997-11-11

    申请号:US773782

    申请日:1996-12-26

    CPC classification number: B01D15/1828 C07C7/135 B01D2215/023

    Abstract: A process for regulating at least one flow of at least one fluid or effluent circulating in a simulated moving bed comprising columns which form a closed loop containing at least one device such as a recycling pump introducing a pressure anisotropy. Every time an injection or extraction point passes from one part of the pump to the other, a control device which controls a fluid flow regulating means for the fluid under consideration, regulated about a set value, is caused to stop regulation temporarily, and substantially simultaneously the regulating means is placed in a position which allows it to approach the desired value, preferably to reach the desired flow rate and to begin to regulate the flow rate about the desired set value, to keep the flow rates in all the zones in a simulated moving bed constant. The process is especially applicable Application to the separation of para-xylene from a mixture of xylenes.

    Abstract translation: 用于调节在模拟移动床中循环的至少一种流体或流出物的至少一个流的方法,所述流体或流出物包括形成闭合回路的塔,所述闭合回路包含至少一个装置,例如引入压力各向异性的再循环泵。 每当注射或提取点从泵的一部分通过到另一部分时,控制装置将控制被考虑的流体的流体流动调节装置约为设定值,以暂时地,基本同时地停止调节 调节装置被放置在允许其接近期望值的位置,优选地达到期望的流速并开始调节围绕期望的设定值的流速,以将模拟的所有区域中的流速保持在模拟 移动床不变。 该方法特别适用于从二甲苯混合物中分离对二甲苯。

    Working fluid mixtures for use in thermodynamic compression cycles
comprising trifluoromethane and chlorodifluoroethane
    8.
    发明授权
    Working fluid mixtures for use in thermodynamic compression cycles comprising trifluoromethane and chlorodifluoroethane 失效
    用于热力学压缩循环的工作流体混合物,包括三氟甲烷和氯二氟乙烷

    公开(公告)号:US4812250A

    公开(公告)日:1989-03-14

    申请号:US124144

    申请日:1987-11-23

    CPC classification number: C09K5/045 C09K2205/122 C09K2205/34

    Abstract: The invention concerns non-azeotropic fluid mixtures useful in compression thermodynamic cycles, for example in heat pumps, comprising R23, R142b and optionally a fluid (c) other than R23 or R142b, selected from the group formed of methane and ethane halogenated compounds having a boiling point from -85 to +60.degree. C., in such molar proportions that the R23/R142b ratio range from 0.01:1 to 1.10:1 and the (R23+R142b)/(R23+R142b +c) molar ratio from 0.26:1 to 1:1.The mixtures according to the invention can be used as working fluid for heat pumps whose fluid circulates through an evaporator (E.sub.1), a compressor (K.sub.1), a condenser (E.sub.2) and a pressure reducer (D.sub.1). The thermal exchanges take place respectively with external fluids (5,6) and (7,8).The mixtures according to the invention may supply heat to the condenser at a temperature from +50 to +100.degree. C. while having an internal pressure generally limited to 0.3 MPa.

    Abstract translation: 本发明涉及可用于压缩热力学循环的非共沸混合流体混合物,例如在热泵中,包括R23,R142b和任选的除R23或R142b以外的流体(c),其选自甲烷和乙烷卤代化合物,其具有 沸点为-85至+60℃,摩尔比为R23 / R142b比为0.01:1至1.10:1,(R23 + R142b)/(R23 + R142b + c)摩尔比为0.26 :1比1:1。 根据本发明的混合物可用作流体通过蒸发器(E1),压缩机(K1),冷凝器(E2)和减压器(D1)循环的热泵的工作流体。 热交换分别与外部流体(5,6)和(7,8)进行。 根据本发明的混合物可以在+50至+ 100℃的温度下向冷凝器供应热量,同时内部压力通常限制在0.3MPa。

    Aromatic polyimide compositions of high solubility and their uses
    9.
    发明授权
    Aromatic polyimide compositions of high solubility and their uses 失效
    高溶解度的芳族聚酰亚胺组合物及其用途

    公开(公告)号:US4736015A

    公开(公告)日:1988-04-05

    申请号:US435153

    申请日:1982-10-19

    CPC classification number: C08G73/10

    Abstract: Aromatic polyimide compositions, useful in particular for manufacturing adhesive materials, varnishes and films withstanding high temperatures, having a high solubility in organic solvents, particularly polar solvents and which are manufactured by reacting, in such a solvent, a tetraester or diacid-diester of benzhydrol 3,3', 4, 4' tetracarboxylic acid with an aromatic diamine for a sufficient time to obtain a polycondensation reaction product having an inherent viscosity at 30.degree. C., at a concentration of 5 g/liter in N-methyl pyrrolidone, ranging from 0.1 to 2 dl/g.

    Abstract translation: 芳族聚酰亚胺组合物,特别用于制造粘合剂材料,耐高温清漆和薄膜,在有机溶剂特别是极性溶剂中具有高溶解度,并且通过在这种溶剂中使二苯甲酮的四酯或二酸二酯 3,3',4,4'-四羧酸与芳族二胺反应足够的时间,得到在30℃下的特性粘度,在N-甲基吡咯烷酮中浓度为5g /升的缩聚反应产物,其范围 为0.1〜2d / g。

    Detergent compositions, their manufacture and their use as additives for
fuels
    10.
    发明授权
    Detergent compositions, their manufacture and their use as additives for fuels 失效
    洗涤剂组合物,其制造及其作为燃料添加剂的用途

    公开(公告)号:US4375974A

    公开(公告)日:1983-03-08

    申请号:US281532

    申请日:1981-07-08

    CPC classification number: C10L1/2383 C08F8/32

    Abstract: A nitrogen-containing composition, useful as a detergent for gasoline, is obtained by reacting at least one unsaturated anhydride with at least one olefin to convert 20-80% of the anhydride and thereafter reacting the resultant product with a polyamine of the general formulaH.sub.2 N--[(--CH.sub.2 --)--.sub.n NH].sub.m R.sup.7wherein R.sup.7 is a monovalent aliphatic radical of 6-30 carbon atoms, n is an integer from 2 to 5 and m is an integer from 1 to 10.

    Abstract translation: 可用作汽油洗涤剂的含氮组合物是通过使至少一种不饱和酸酐与至少一种烯烃反应来转化20-80%的酸酐,然后使所得产物与通式为H2N的多胺反应 - [( - CH2 - ) - n NH] mR7其中R7是6-30个碳原子的一价脂族基团,n是2至5的整数,m是1至10的整数。

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