Unlock instant, AI-driven research and patent intelligence for your innovation.

Dewaxing process

A technology of dewaxing and feeding, which is applied in the fields of hydrocarbon oil cracking, petroleum industry, refining hydrocarbon oil, etc., and can solve the problems of high operating cost and serious environmental impact

Inactive Publication Date: 2001-02-14
CHEVROU USA INC
View PDF37 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, various solvent removal techniques have been used to remove these waxes, such as propane dewaxing and methyl ethyl ketone dewaxing; however, these techniques have high operating costs, severe environmental impact and produce oils of inferior quality to catalytically-dewaxed oils

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Dewaxing process
  • Dewaxing process

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] 2. Special preparation:

[0027] Molecular sieves can be combined with other materials that are stable to the temperatures and other conditions used in the dewaxing process. Such matrix materials include active and inactive materials and synthetic or naturally occurring zeolites as well as inorganic materials such as clays, silica and metal oxides. Inorganic materials may be naturally occurring or in the form of gelatinous precipitates, sols or gels, mixtures including silica and metal oxides. Inactive materials are suitable as binders or as diluents to control the amount of conversion in the dewaxing process so that the product can be obtained economically without using other means of controlling the reaction rate.

[0028] Silicoaluminophosphates can be combined with naturally occurring clays such as bentonite and kaolin. These materials, clays, oxides, etc. function in part as binders for the catalyst. It is desirable to provide a catalyst with good crush strengt...

Embodiment approach

[0111] The invention is further illustrated by the following examples, which are given purely by way of illustration of the invention.

[0112] The benefits of fractionator bottoms recycle operation have been demonstrated in large-scale pilot plant tests. For demonstration start-ups, the isomerization dewaxing reactor was loaded with approximately 5,000 cubic centimeters of precious metal impregnated SAPO-11 catalyst, and the hydrofinishing reactor was loaded with approximately 5,000 cubic centimeters of Chevron's proprietary hydrofinishing catalyst. In-line distillation produces 3 lube oil fractions and a middle distillate. The pilot plant was configured to simulate the process flow diagram shown in FIG. 1 .

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
boiling pointaaaaaaaaaa
viscosity indexaaaaaaaaaa
Login to View More

Abstract

The process of the present invention for converting hydrocarbon oils comprises the following steps: (1) In the presence of added hydrogen, contacting a hydrocarbon oil feed with a catalyst selected from SAPO-11, SAPO-31 or SAPO-41 medium pore size silicoaluminophosphate molecular sieves and hydrogenation components, and mixtures thereof, wherein at least a portion of the feed is converted; and (2) passing at least a portion of the converted feed to a fractionation column wherein at least a portion of the converted feed is fractionated, thereby producing at least one overhead fraction and one bottoms fraction; and (3) mixing at least a portion of the bottoms fraction with the hydrocarbon oil feed of step (1).

Description

field of invention [0001] This invention relates to a method for catalytic dewaxing of lubricating oils. More specifically, the invention relates to a process for dewaxing a hydrocarbon oil feed wherein at least a portion of the fractionation bottoms is recycled to the feed. Background of the invention [0002] Methods for dewaxing certain petroleum distillates are well known. Dewaxing is required when high paraffinic oils are used in products that must flow at low temperatures such as lubricating oils, fuel oils, and jet fuels. The higher molecular weight linear normal, substituted and low branched chain paraffins present in such oils are waxes which cause high pour and cloud points of the oil. If a sufficiently low pour point is to be obtained, the wax must be completely or partially removed. In the past, various solvent removal techniques have been used to remove these waxes, such as propane dewaxing and methyl ethyl ketone dewaxing; however, these techniques have high...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C10G47/12C10G45/64C10G47/16C10G47/20
CPCC10G45/64C10G47/16
Inventor J·M·罗森鲍姆R·L·豪厄尔
Owner CHEVROU USA INC