Sulphur containing additive for making bitumen paving mixtures

Patent metadata

Field	Value
Publication number	US-10479876-B2
Application number	US-201615560725-A
Country	US
Kind code	B2
Filing date	Mar 22, 2016
Priority date	Mar 25, 2015
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

The present disclosure relates to a sulphur containing additive for bitumen paving mixtures. The sulphur containing additive comprises sulphur, a mixture of metal oxides, and optionally 5 at least one metal sulphate. The mixture of metal oxides includes calcium oxide, silicon dioxide, aluminum oxide and ferric oxide.

First claim

The invention claimed is:

1. A sulphur containing additive for bitumen paving mixtures, said sulphur containing additive comprising:
a. sulphur;
b. a mixture of metal oxides; and
c. optionally, at least one metal sulphate,
wherein said mixture of metal oxides comprises calcium oxide in an amount in the range of 50 weight % to 60 weight %, silicon dioxide in an amount in the range of 25 weight % to 30 weight %, aluminium oxide in an amount in the range of 1 weight % to 2 weight %, and ferric oxide in an amount in the range of 8 weight % to 10 weight %.

2. The sulphur containing additive as claimed in claim 1 , wherein
a. said sulphur is in an amount in the range of 85 to 98 weight % of said sulphur containing additive;
b. said mixture of metal oxides is in an amount in the range of 2 to 15 weight % of said sulphur containing additive; and
c. said at least one metal sulphate is in an amount ranging from 0 to 10 weight % of said sulphur containing additive.

3. The sulphur containing additive as claimed in claim 1 , wherein said metal sulphate is calcium sulphate.

4. The sulphur containing additive as claimed in claim 1 , wherein said sulphur containing additive is molded into at least one solid article shape selected from the group consisting of pastilles, flakes, extrudates and granules.

5. A process for preparing said sulphur containing additive as claimed in claim 1 for said bitumen paving mixture, said process comprising the following steps:
a. melting said sulphur at a temperature up to 160° C. in a reactor to obtain molten sulphur;
b. adding said mixture of metal oxides, optionally said metal sulphate to said molten sulphur to obtain a blend;
c. melting and stirring said blend at a temperature up to 160° C. to obtain a molten blend; and
d. cooling said molten blend to obtain said sulphur containing additive.

6. A process for preparing the sulphur containing additive as claimed in claim 1 for said bitumen paving mixture, said process comprising the following steps:
a. mixing said mixture of metal oxides and optionally said metal sulphate with sulphur to obtain a blend;
b. melting and stirring said blend at a temperature up to 160° C. to obtain a molten blend; and
c. cooling said molten blend to obtain said sulphur containing additive.

7. A process for preparing a bitumen paving mixture, said process comprising mixing said sulphur containing additive of claim 1 to bitumen at a temperature in the range of 80 to 180° C. and stirring at a speed ranging from 20 to 100 rpm.

Assignees

• Reliance Industries Ltd

Inventors

• Jasra Raksh Vir
• Murthy Nagarathinam Shenbaga
• Talati Mayur Navinchandra
• John Lintoan
• Pothuru Srinivasarao
• Kumar Satish
• Sidhpuria Kalpeshkumar Bhikhubhai
• Niwate Yogesh Suresh
• Kumar Prakash
• Gopalakrishnan Kalpana
• Puranik Vijayalakshmi Ravi

Classifications

• C08K2003/3045

  Sulfates · CPC title

• C08K3/34

  Silicon-containing compounds · CPC title

• C08K3/30

  Sulfur-, selenium- or tellurium-containing compounds · CPC title

• C04B26/26

  Bituminous materials, e.g. tar, pitch {(C08L95/00 takes precedence)} · CPC title

• C08K2003/2227

  of aluminium · CPC title