摘要:
A process for producing a synthetic hydrocarbon product is provided comprising contacting under isomerization conditions an olefin feed comprising linear olefins with a catalyst comprising an intermediate pore size molecular sieve, wherein the catalyst is substantially free of Group VIII metals. The synthetic hydrocarbon product exhibits a low pour point and low toxicity to marine life.
摘要:
A touch sensor switch that responds to touching, or even to the proximity of an object, is disclosed. The switch includes a number of capacitance elements, or touch pads, that produce an effective capacitance dependent upon the physical proximity of the object. A microcontroller under control of a program stored in a read-only memory causes its I/O port to set a transient voltage on each capacitance element as a logic level. Each transient voltage is at variance with the capacitive element's preferred voltage level. The program then reads the I/O port, and hence the logic levels of the capacitance elements, as the capacitive elements revert to their preferred voltage levels, and calculates the proximity of the object, or touching, from relationships among recorded signals. The circuit may also be embodied in an application specific integrated circuit.
摘要:
The present invention relates to synthetic hydrocarbons produced by skeletal isomerization, and the isomerization process. The products are especially useful as the continuous phase of a drilling fluid, for example when prepared from C.sub.14 to C.sub.18 linear alpha-olefins via isomerization or hydroisomerization, and as lube oils. The present invention also relates to a process for producing synthetic hydrocarbons by skeletally isomerizing C.sub.12+ olefins over a catalyst comprising an intermediate pore size molecular sieve, with or without Group VIII metals under skeletal isomerization conditions which result in little, preferably in substantially no, olefin cracking or oligomerization.
摘要:
A method is provided of selecting operating parameters for an aromatization process having at least penultimate and final stages, each containing a respective catalyst, for optimum aromatic barrel per calendar day (AB/CD) production of product having a selected RON and/or over a particular run length. The catalyst lives are determined at constant LHSV for the penultimate and final stage catalysts for a given feed RON to each stage as a function of the change in RON from that of the feed to that of the C.sub.5+ effluent from the respective stage. The penultimate stage C.sub.5+ effluent RON is selected to be such that the lives of the catalysts in each stage are substantially equal. Preferably the yield of C.sub.5+ effluent from each stage and the life of the catalyst used in each stage is determined as a function of the pressure of that stage. The operating pressures of the stages are then selected to be within about 30% of that which gives the highest AB/CD.
摘要:
The present invention relates to a process for producing a lube oil having a low pour point and excellent viscosity and viscosity index comprising isomerizing a waxy feed over a catalyst comprising a molecular sieve having generally oval 1-D pores having a minor axis between about 4.2 .ANG. and about 4.8 .ANG. and a major axis between about 5.4 .ANG. and about 7.0 .ANG. and at least one group VIII metal. SAPO-11, SAPO-31, SAPO-41, ZSM-22, ZSM-23 and ZSM-35 are examples of useful catalysts.
摘要:
The preferred reforming and/or benzene production catalyst is an intermediate pore size zeolite which has a high degree of crystallinity and a small crystallite size. The reforming or benzene production process using the catalyst is preferably run without added hydrogen, and at low pressures and temperatures.
摘要:
A method is disclosed for preparing a silicoaluminophosphate molecular sieve, characterized in that the P.sub.2 O.sub.5 to alumina mole ratio at the surface is about 0.85 or less, the P.sub.2 O.sub.5 to aluminia mole ratio of the bulk is 0.94 or greater and the silicon content at the surface is greater than that of the bulk, from a reaction mixture containing particles less than 80 microns in diameter.
摘要翻译:公开了一种制备硅铝磷酸盐分子筛的方法,其特征在于表面处的P 2 O 5与氧化铝摩尔比为约0.85或更小,本体的P2O5与氧化铝摩尔比为0.94或更大,并且表面的硅含量为 大于体积的反应混合物,其直径小于80微米的反应混合物。
摘要:
A naphtha feed is contacted in a penultimate reforming stage under catalytic reforming conditions with a first catalyst. The effluent from the penultimate reforming stage is contacted in a final reforming stage under catalytic reforming conditions and at substantially the same pressure as is maintained in the penultimate reforming stage with a second catalyst. The reforming pressure is selected to provide optimal OB/CD production of product reformate of a desired RON from the final stage.
摘要:
Lubricating oils are prepared by a process whereby a hydrocarbonaceous feedstock is hydrocracked and subsequently dewaxed over a crystalline silicoaluminophosphate SAPO-11 containing platinum and/or palladium.
摘要:
A process for improving the storage stability of hydrocracked neutral oil lubricating oil stocks comprising a dewaxing step utilizing a high silica zeolite catalyst to produce a dewaxer effluent and two stabilizing steps utilizing hydrofinishing and nonhydrogenative stabilization by an acidic catalyst.