Showing papers by "ExxonMobil published in 1968"

Antifoulant additive for steam-cracking process

Abstract: 1307542 Reducing coke formation in tubular cracking ESSO RESEARCH & ENG CO 21 May 1970 24628/70 Heading C5E In the production of unsaturated hydrocarbons, e.g. ethylene and butadiene, by thermal cracking of a hydrocarbon feed in the presence of steam in a tubular furnace, coke formation is reduced by providing a phosphorus compound and/or a bismuth compound in the vapour phase in the cracking zone. Suitable compounds are listed, and may be added continuously or intermittently or even as a pretreatment of the tubes since they have been found to exhibit a lasting effect. Coke reduction is obtained even with highsulphur feeds. In examples the feed is ethane or high-sulphur ethane, and the P or Bi is added in the form of H 3 PO 4 , trimethyl phosphate, PH 3 or Bi 2 O 3 .

Method of propping fractures with ceramic particles

Abstract: A method of propping fractures in a subterranean formation employs hard, ceramic particles having oppositely disposed surface elements which are linear and paralled. The composition of the particles may be glass or other ceramic material having a resistance to impact abrasion at least as great as soda-lime-silica glass. The particles may have the configuration of cylinders, rods, parallelepipeds, prisms, cubes, plates or other configuration which will have linear elements on its surface which are oppositely disposed and parallel. (9 claims)

Process for graft polymerization

Abstract: Aluminum trialkyl and aluminum dialkyl monohalide catalysts can be used to graft cationically polymerizable monomers, such as styrene, chloroprene, isobutylene, etc. to halogenated polymers with some highly reactive halogen atoms such as PVC, neoprene, chlorobutyl, etc.

Method for consolidating formations surrounding boreholes with resin

Abstract: A method for consolidating an incompetent formation surrounding a borehole is described in which a low molecular weight glycol ether is injected into the formation, and a resin is employed to bond the formation solids in place. Tests have shown that pretreatment of the formation with the glycol either facilitates injection of the resinous material, improves the strength obtained on setting of the resin, reduces permeability losses during the consolidation process, and eliminates the necessity for a waiting period between the pretreatment and injection of the resin-forming material. (20 claims)

Microwave vibrating resonating cavity and drying process

Abstract: 1277609 Drying polymers with microwaves ESSO RESEARCH & ENG CO 5 Dec 1969 [23 Dec 1968] 59422/69 Addition to 1226988 Heading F4G [Also in Division H5] The method of drying non-polour polymers, as described in the parent Specification is modified by replacing the belt conveyor by one or more vibrating acrobating microwave resonating cavities, which convey the polymer through the cavity when inclined to the horizontal. The microwave frequency falls within the range 600 Fo 40,000 MHz.

Protective dome for underwater mooring swivel

Abstract: 1,220,651. Mooring ships. ESSO RESEARCH & ENG. CO. 1 April, 1969 [8 May, 1968], No. 16994/69. Heading B7S. An underwater mooring comprises a base 22, a frame 10 rotatably mounted in bearings 20, 21, a swivel joint 26 rotatable with the frame, a conduit 38 for transferring fluid cargo to and from the swivel joint, a water excluding dome 40 secured to the frame and means for introducing into the dome a fluid at a pressure sufficient to exclude water from the region of the bearings and the swivel joint. In the embodiment shown float controlled valve 58 admits a gas such as oxygen or nitrogen through line 54 to keep the seawater at level 60.

Process for reducing the pour point of shale oil

Abstract: The pretreatment of raw shale oil before it is introduced into a pipeline for transmission to a refinery is described. The raw shale oil is pretreated to lower the pour point and reduce the nitrogen content by separating the shale oil into 2 portions, hydrodenitrogenating the first portion and visbreaking the second portion. The heavy portion of the visbroken shale oil (1,000/sup 0/F+) is an effective pour-point reducer when blended with the hydrodenitrogenated shale oil or with hydrodenitrogenated light (1,000/sup 0/F-) visbroken shale oil. The light visbroken shale oil may be hydrodenitrogenated (separately or along with the total shale oil) and made a part of the hydrodenitrogenated shale oil to which is added the heavy visbroken shale oil pour-point reducing agent. The heavy visbroken oil should be used in quantities of from about 2% by wt to about 30% by wt of the final product. (10 claims)

Hydrodesulfurization of heavy petroleum distillates

Abstract: 1,262,339. Hydrodesulphurisation catalysts. ESSO RESEARCH & E NG . CO. 17 April, 1969 [3 May, 1968], No. 19717/69. Heading B1E. [Also in Division C5] A hydrocarbon hydrodesulphurisation catalyst comprises Mo or W oxide or sulphide plus Co or Ni oxide or sulphide (or mixtures) on a SiO 2 -Al 2 O 3 base containing 1 to 6% SiO 2 , and has a maximum of pores in the range 30 to 70S. It may be prepared from aluminium sulphate, chloride or nitrate and sodium silicate; or from sodium aluminate containing silica by precipitation with aluminium halides, nitrate or sulphate or with HCl, HNO 3 or H 2 SO 4 , followed by impregnating with metal salts. Preferably the support is prepared in the presence of galatonic acid, araboric acid, xylonic acid, mannonic acid or gluconic acid or a sodium, potassium, zinc, magnesium, calcium or lithium salt thereof and has an apparent bulk density of less than 0.70 g./cc.

Volumetric metering device for particulate solids

Abstract: 1,241,446. Metering particulate material. ESSO RESEARCH & ENG. CO. 4 July, 1968 [18 July, 1967; 3 June, 1968], No. 31922/68. Heading B8N. Apparatus for metering volumetric quantities of particulate abrasive solids comprises a wall defining a housing 29, a rotary drum 31 mounted on a substantially horizontal axle 38 extending through the housing, recesses provided on the drum by radial blades 32 and side walls 36 1 , 36 2 , for collecting solids fed thereto as the drum is rotated, an inlet 30 extending downwardly from an elevated source for conveying particulate solids to the recesses, the terminus of the inlet being located sufficiently close to the blades 32 so that each recess when located beneath the inlet will be filled to a depth no greater than the depth at which the material can attain its angle of repose without overflowing from the recess an outlet located below the drum, and means for rotating the drum. The drum, the blades and the outermost circumferential walls are spaced from the internal walls of the housing by a distance greater than the maximum particle size of material to be metered. As described, the apparatus is used for metering iron ore particles to a reactor, and the housing 29 is pressurized. The drum may have a plurality of recesses across its width and the inlet shoot 30 may have a rectangular or triangular section and may be provided at its end with a shroud which extends parallel to the drum surface. A skewed relationship may be provided between the inlet and the recesses so that an increment of ore is spread over several recesses. This may be effected by locating a rectangular section inlet shoot with its length at an angle to the width of the drum, or by providing the drum with recesses which are separated by oblique blades.