High purity paraffinic solvent compositions

Details High purity paraffinic solvent compositions High purity paraffinic solvent compositions

1998-05-19

1999-05-25

Griffin, Walter D.

Mineral oils: processes and products

Products and compositions

208 17, 585 1, 585 13, C10L 104

Patent

active

059067276

ABSTRACT:
Discloses high purity solvent compositions constituted of n-paraffins and isoparaffins, with the isoparaffins containing predominantly methyl branches, and having an isoparaffin:n-paraffin ratio sufficient to provide superior low temperature properties and low viscosities. The solvent compositions are made by a process wherein a waxy, or long chain paraffinic feed, especially a Fischer-Tropsch wax, is reacted over a dual function catalyst to produce hydroisomerization and hydrocracking reactions at 700.degree. F.+ conversion levels ranging from about 20 to 90 wt.% to provide a C.sub.5 -1050.degree. F. crude fraction. The C.sub.5 -1050.degree. F. crude fraction is then topped via atmospheric distillation to produce a low boiling fraction with an upper end point boiling between about 650.degree. F. and 750.degree. F. The low boiling fraction is fractionated and a narrow boiling range solvent obtained therefrom; one which can be further divided into solvent grades of various boiling ranges.

REFERENCES:
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patent: 2906688 (1959-09-01), Farmer et al.
patent: 3507776 (1970-04-01), Hann
patent: 3660058 (1972-05-01), Feldman et al.
patent: 4832819 (1989-05-01), Hamner
patent: 4919786 (1990-04-01), Hamner et al.

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