초록 ▼

Process for dewatering organic liquids admixed with water wherein the admixture is brought into contact with a molecular sieve. The moleculat sieve is pretreated so as to reduce its acid site concentration and attain an ammonia TPD value of 18 mmol/g or less prior to contact with the admixture. The

Process for dewatering organic liquids admixed with water wherein the admixture is brought into contact with a molecular sieve. The moleculat sieve is pretreated so as to reduce its acid site concentration and attain an ammonia TPD value of 18 mmol/g or less prior to contact with the admixture. The present invention relates to a process for dewatering organic liquids admixed with water, said process comprising bringing the admixture into contact with a molecular sieve, characterized in that the molecular sieve is pretreated so as to reduce its acid site concentration and attain an ammonia TPD value of 18 mmol/g or less prior to contact with the admixture.

대표청구항 ▼

1. A process for dewatering organic liquids admixed with water, said process comprising bringing the admixture into contact with a molecular sieve, wherein the molecular sieve is pretreated so as to reduce its acid site concentration and attain an ammonia TPD value of 18 μmol/g or less prior to cont

1. A process for dewatering organic liquids admixed with water, said process comprising bringing the admixture into contact with a molecular sieve, wherein the molecular sieve is pretreated so as to reduce its acid site concentration and attain an ammonia TPD value of 18 μmol/g or less prior to contact with the admixture. 2. A process as claimed in claim 1, wherein said molecular sieve is pretreated so as to reduce its acid site concentration and attain an ammonia TPD value of 1-11.5 μmol/g. 3. A process as claimed in claim 1, wherein said molecular sieve is a zeolitic molecular sieve having an average pore diameter of about 3 Angstroms (.ANG.). 4. A process as claimed in claim 1, wherein said molecular sieve is in a potassium cation form. 5. A process as claimed in claim 1, wherein said pretreatment is carried out by bringing said molecular sieve into contact with a solution of an ammonium or an alkali metal salt. 6. A process as claimed in claim 5, wherein said pretreatment is carried out by bringing said molecular sieve into contact with a solution of an ammonium or an alkali metal salt having a concentration of 0.01 to 2 molar. 7. A process as claimed in claim 1, wherein said pretreatment is carried out by bringing said molecular sieve into contact with a solution of sodium nitrate or potassium nitrate. 8. A process as claimed in claim 1, wherein said pretreatment is carried out at a temperature of 10 to 90° C. 9. A process as claimed in claim 1, wherein said pretreatment causes the TPD value of the molecular sieve to be reduced by at least 40%. 10. A process as claimed in claim 1, wherein said molecular sieve is bound by a binder. 11. A process as claimed in claim 10, wherein said molecular sieve is bound by a binder formed of montmorillonite, kaolin, sepiolite or attapulgite. 12. A process as claimed in claim 1, wherein after said pretreatment step, said admixture is brought into contact with the pretreated molecular sieve by packing a column with an amount of said pretreated molecular sieve, and then passing said admixture therethrough. 13. A process as claimed in claim 1, wherein after said pretreatment step, said admixture is brought into contact with the pretreated molecular sieve at a temperature of 110-120° C. by packing a column with an amount of said pretreated molecular sieve, and then passing said admixture therethrough. 14. A process as claimed in claim 1, which further comprises the step of regenerating the molecular sieve after said molecular sieve is contacted with said admixture. 15. A process as claimed in claim 14, wherein said regeneration step is carried out by temperature swing desorption or pressure swing desorption. 16. A process as claimed in claim 1, wherein said organic liquid comprises an alcohol. 17. A process as claimed in claim 16, wherein said alcohol is selected from the group consisting of: ethanol, isopropanol, secondary butanol and tertiary butanol. 18. A process as claimed in claim 1, wherein said organic liquid comprises an ester. 19. A process as claimed in claim 18, wherein said ester is selected from the group consisting of: n-propyl formate, ethyl acetate, butyl acetate, methyl propionate and ethyl isobutyrate.