1. A method for separating HBr from HBr-containing hydrocarbons, comprising:
a) providing a container and a solid material composed of at least one metal oxide and a support therein; contacting HBr-containing hydrocarbons with the solid material at a certain temperature; reacting the metal oxide with HBr to produce metal bromide and water; directing the hydrocarbons into a storage tank;
b) switching HBr-containing hydrocarbons to another similar container when metal oxide exhausts, to perform the process a); purging first container by steam; directing oxygen or air into first container, regenerating metal oxide at a certain temperature and recycling Br2;
c) connecting two or more such containers by switch valve and thereby forming a purification system, cycling the process a) and process b) and HBr is separated from HBr-containing hydrocarbons.
2. A method as claimed in claim 1, wherein said hydrocarbons are alkanes, alkenes andor aromatics.
3. A method as claimed in claim 1, wherein said metal oxide is selected from MgO, CoO, Co2O3, CuO and mixture thereof.
4. A method as claimed in claim 3, wherein said metal oxide is prepared by soaking the support in the solution of one or more acetate, nitrate andor bromide of Mg, Co and Cu, and then drying and calcining them.
5. A method as claimed in claim 1, wherein said support is silica.
6. A method as claimed in claim 1, wherein said silica is commercial silica or prepared from silicates, SiCl4 or silica ester.
7. A method as claimed in claim 1, wherein the step of contacting HBr-containing hydrocarbons with the solid material is carried out at a temperature of between about 100 \u25a1 and about 600 \u25a1.
8. A method as claimed in claim 7, wherein the step of contacting HBr-containing hydrocarbons with the solid material is carried out at a temperature of between about 150 \u25a1 and about 400 \u25a1.
9. A method as claimed in claim 8, wherein the step of contacting HBr-containing hydrocarbons with the solid material is carried out at a temperature of between about 170 \u25a1 and about 300 \u25a1.
10. A method as claimed in claim 1, wherein the step of regenerating metal oxide is carried out at a temperature of between about 250 \u25a1 and about 600 \u25a1.
11. A method as claimed in claim 10, wherein the step of regenerating metal oxide is carried out at a temperature of between about 300 \u25a1 and about 500 \u25a1.
12. A method as claimed in claim 11, wherein the step of regenerating metal oxide is carried out at a temperature of between about 320 \u25a1 and about 450 \u25a1.
13. A method as claimed in claim 1, wherein the purification system is composed of 2\u02dc8 containers filled with the solid material connected by switch valve.
14. A method as claimed in claim 13, wherein the containers are columnar fixed bed reactors.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An additive package for warm-mix asphalt formulations for the pavement of road surfaces, said additive package comprising
a) from about 20 to about 60 wt %, based on the total weight of the additive package of surfactant component, and
b) about 30 to about 80 wt % of the additive package of an asphalt rheology modifying component,
wherein said asphalt rheology modifying component comprises at least one wax component and at least one resin component,
wherein the surfactant component comprises at least one surfactant selected from the group consisting of amines, diamines, polyamines, ethoxylated amines, ethoxylated alkyl diamines, ethoxylated alkyl polyamines, amido amines, amidopolyamines, imidazolines, any of their corresponding organic or inorganic salts, and mixtures thereof,
wherein the wax component is selected from the group consisting of carnuba wax, beeswax, montan wax from coal, Fischer Tropsch wax from coal, petroleum or gas origin, amide waxes, fatty acids and soaps; fatty alcohols, hydrogenated fats, fatty esters, and mixtures thereof,
wherein the resin component is selected from the group consisting of tall oil pitch, pine tar pitch, tall oil rosins, rosin acids, pine rosins, gum rosins, maleated rosins, fumarated rosins, resinous by-products from tall oil processing or the processing of gum rosins, petroleum resins, phenolic resins, maleated tall oil pitch, tall oil heads, natural rubber, styrene butadiene rubber, polychlorprene, crumb rubber, asphaltenes, uintahite, dried asphalt, Trinidad refined asphalt, by-products from the deasphalting of oils, oxidised asphalts, zero penetration asphalts, and mixtures thereof, and
wherein said resin component has a Drop melt point >60\xb0 F. and a Penetration <50 at 25\xb0 C.
2. The additive package of claim 1 wherein the surfactant component comprises at least one surfactant selected from the group consisting of
I. Amines
wherein R is a saturated or unsaturated, substituted or unsubstituted, optionally branched or cyclic, hydrocarbon group with 8-24 carbon atoms, R1 and R2 can be the same or different and are hydrogen or hydrocarbon chain with 1-24 carbon atoms;
II. Diamines and Polyamines
R\u2014(NH\u2014R3)x\u2014NH2
where R has the same meaning as above, and R3 represents a linear or branched hydrocarbon radical with 1-6 carbon atoms, and x represents an integer of less than or equal to six;
III. Ethoxylated andor Propoxylated Amines
where R has the same meaning as above; and x and y are independently 0, 1 or 2 and each R4 is independently H or CH3;
IV. Ethoxylated andor Propoxylated alkyl Diamines and ethoxylated alkyl polyamines
wherein R and R3 have the same meaning as above; x, y, and z are independently 0, 1 or 2 and x+y+z< or =5, and each R4 is independently H or CH3;
V. Amido amines
wherein R, R1, R2 and R3 has the same meaning as above; and
VI. Amidopolyamines and imidazolines
RCO\u2014(NH\u2014R3)x\u2014NH2
wherein R and R3 have the same meaning as above, and x=an integer of from 1 to 10.
3. The additive package of claim 1 wherein said surfactant component comprises at least one amine andor modified amine surfactant selected from the group consisting of ethoxylated tallow amines, fatty amines, fatty amine derivatives, tall oil amidoaminesimidazolines, bis hexamethylene triamine and higher oligomers of hexmethylediamine, alkyl amine surfactants with a hydrocarbon chain consisting of 8 to 22 carbon atoms and mixtures thereof.
4. The additive package of claim 1 wherein said surfactant component is selected from the group consisting of tallow n-propylene diamine, tris-ethoxylated tallow N-propylene diamine, a mixture of imidazolines and amidopolyethylenepolyamines, a mixture of imidazolines and amidoamines, hydrogenated tallow propylene diamine, ethoxylated hydrogenated tallow propylene diamine, tallow dipropylene triamine, tallow tripropylene tetramine and derivatives thereof, and amides resulting from the condensation fatty acids with dimethylaminopropylamine.
5. The additive package of claim 1 wherein said wax component is selected from the group consisting of paraffin wax, polyethylene wax, ethylene bis stearamide, stearyl amide, stearylstearamide; aluminum stearate, calcium stearate, fatty acids; fatty alcohols, hydrogenated fats, fatty esters and mixtures thereof.
6. The additive package of claim 5 wherein the congealing point of said wax is between 60\xb0 C. and 150\xb0 C. with a Brookfield viscosity at 135\xb0 C. in the range of 10-40 cPs.
7. A warm mix asphalt formulation for the pavement of road surfaces, said formulation comprising a mixture of bitumen and aggregates, and from about 0.2 to 10% by weight of the additive package of claim 1, based on the weight of the asphalt.
8. The formulation of claim 7 wherein the temperature required to compact said asphalt is 15-60\xb0 F. lower than conventional hot mix asphalts.
9. The asphalt formulation of claim 7 wherein said asphalt and aggregates are mixed in a mixer, and wherein said additive package a) is blended into said asphalt binder before the aggregates are introduced to the mixer; or b) added to the aggregates, or portion of the aggregates before the asphalt is introduced to the mixer; or c) added to the mixer after the asphalt has been added to the aggregate in said mixer, or combinations of a)-c).
10. A method for lowering the compaction temperature of warm mix asphalt, said method comprising adding to said warm mix asphalt a compaction temperature lowering amount of the additive package of claim 1.
11. The method of claim 10 wherein from about 0.2 to 10% by weight of the additive package of claim 1, based on the weight of the asphalt, is added to said warm mix asphalt, and wherein the temperature required to compact said asphalt is at least 15-60\xb0 F. lower than conventional hot mix asphalts.
12. The warm mix asphalt of claim 7 wherein said additive package is added as a single package, or the individual components of said package are added separately to the warm mix asphalt.
13. The warm mix asphalt of claim 7 wherein the additive package, or individual components thereof, are added at various stages of the warm mix process.
14. The warm mix asphalt of claim 13 wherein the additive package, or individual components thereof are blended into the asphalt binder before the asphalt is introduced to the aggregate in the hot-mix plant, added to the aggregate, or a portion of the aggregate, before asphalt is added to the mixer, andor added to the mixer in the hot-mix plant after asphalt has been added to the aggregate.