Methanol → Boric acid, calcium salt

Temperatur

60 °C

200 g of the same neutral calcium alkylsalicylate (A) as used in Example 1, 26 g of calcium hydroxide (B), 43.4 g (2.0 moles per mole of the calcium hydroxide) of orthoboric acid (C) and 400 g of xylene (F) were put in a 1000-ml four-necked flask fitted with a condenser and heated to 60° C. while agitating. To this mixture was added 120 g of methanol, and the resulting mixture was heated up to a refluxing temperature (66° C.) under agitation and reacted for 4 hours to obtain a reaction product. The reaction product was further heated to 140° C. for 1.5 hours to distill out the methanol, reaction water and xylene. Finally the reaction product was diluted twofold with hexane and filtered to remove any residual solids present, and the hexane was distilled out to obtain a calcium borate overbased alkylsalicylate. However, the thus obtained calcium borate overbased alkylsalicylate caused its gelation and was found generally unusable as an additive for petroleum products.

1. customwere put in a 1000-ml four-necked flask
2. customfitted with a condenser
3. temperaturethe resulting mixture was heated up to a refluxing temperature (66° C.) under agitation
4. customreacted for 4 hours
5. customto obtain a reaction product
6. temperatureThe reaction product was further heated to 140° C. for 1.5 hours
7. distillationto distill out
8. customthe methanol, reaction water and xylene
9. filtrationfiltered
10. customto remove any residual solids present
11. distillationthe hexane was distilled out

ORD-Eintrag

ord-d2eeecd8a0714dbbbb0a8a80d3ebabc8

Quelldatensatz

uspto-grants-1995_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05380508