2,6-Diisopropylnaphthalene, from

Barder, T. (1991) Separation of 2,7 diisopropylnaphthalene from a feed mixture comprising various diisopropylnaphthalene isomers with a zeolite adsorbent. U.S. Patent 5,012,039. 

In more recent times, naphthalene has been used in condensation products from naphthalene sulfonic acids, utili2ing formaldehyde as additives to improve the flow properties of concrete these are referred to as superplastici2ers. Another newer appHcation is the production of diisopropylnaphthalenes. The mutual depression of the melting points in the mixture gives a Hquid which is used as a solvent for dyes in the production of carbonless copy paper. 

These estimations can be documented by the well-known example with the diisopropylnaphthalene (DIPN) contamination in mixed RCP (RCP grade 1.02). This chemical substance comes from NCR carbonless copy paper and is in this mentioned RCP grade on an average level of 23 mg/kg TS [13], despite the fact that since several years those papers tried to be separated in the RCP grade sorted office paper , coloured letters and carbonless copy paper to reduce the DIPN concentration in mixed papers and board. 

JFSSG (1999c) Diisopropylnaphthalenes in food packaging made from recycled paper and board, Food Surveillance Information Sheet 169, available from the Food Standards Agency, Room 303b, P.O. Box 31037, London SW1P 3WG, Tel. No. +44 (0)20 7238 6245/6150, fax +44 (0)20 7238 6330 or email informationcentre foodstandards.gsi.gov.uk... 

The most extensive studies to date on transfer from secondary packaging to foods have been carried out by Jickells and co-workers (Jickells et al., 2005). These studies used combinations of food and packaging as would be used for retail sale. Cartonboard and corrugated board box were used in the study because they are used widely as secondary packaging materials. Model compounds (benzophenone, diheptyl phthalate, 2,6-diisopropylnaphthalene, 2,2-dimethoxyphenylacetophenone, 2-ethylnaphthalene and 2,4,6-... 

MAFF UK Food Surveillance Information (1999), Diisopropylnaphthalenes in food packaging made from recycled paper and board . Sheet No. 169, UK Food Standards Agency website. 

MAFF (January 1999) Diisopropylnaphthalenes in Food Packaging Made from Recycled Paper and Board. Food Surveillance Information Sheet Number 169, MAFF Joint Food Safety Standards Group. 

A new application for naphthalene with considerable growth potential is the production of alkylated naphthalenes, especially that of diisopropylnaphthalenes. Resulting from the mutual depression of melting-points, the mixture of diisopro-pylnaphthalene is liquid and can therefore be used as a high-value solvent for dyes in the production of carbonless copy papers. The solvents for dyes must meet certain preconditions, i. e. exhibit high solvent power, be free from odor, be toxico-... 

Dialkylation of naphthalene with isopropanol to 2,6-diisopropylnaphthalene was catalyzed by HY zeolite modified by Fe +, Ni +, Co +, and Cu + under optimum supercritical conditions (50bar, 220°C, isopropanol/naphthalene=4, WHSV= 18.8h , 6h) [195]. Fe/HY revealed the highest selectivity, by increasing the 2,6/2,7-isomer ratio from 2.8 to 6.6. The selectivity to the desired 2,6-isomer changes in the order Fe-HY > Ni-HY > Cu-HY > Co-HY > HY. The naphthalene conversion was over 73%, reaching 96%. Polyalkylated products were found on zeolites modified by Co and Cu, with a larger amount of coke being formed on these catalysts. 

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