Drying

 

Drying Systems

The need for drying and purification of liquids (including liquefied gases) has been growing consistently in the last few decades. The reasons for drying organic liquids are many and some of them are as under:

  1. Physical effects
  2. Chemical effects
  3. Corrosion effects
  4. Stringent specification

Adsorption is the ideal choice for trace removal of water and it is capable of giving very high ratios (in the range of 100 to 5000) of feed concentration to product concentration of water. Moreover, adsorption is the only practical and cost effective method of removing final traces or dissolved water in organic liquids. Conventional adsorbents like silica gel and activated alumina have been used for drying liquids. But unlike molecular sieves, they have larger sized pores and a wide distribution of pore sizes in the range 10 to 50 angstroms (1Ao = 10-8 cm).

We have a plethora of experience in the field of adsorptive and catalytic drying thanks to the people behind this operation i.e. Mr. Dipak Sheth and Mr. S. B. Umarji. These IIT Bombay Chemical Engineering graduates have been the driving force behind the development of adsorbent based systems for drying, solvent recovery and other applications. In recent years, they have published a paper in the Proceedings of the International Workshop and Symposium on Industrial Drying – 2004 and also given a presentation, which was well received. The paper can be accessed here:

Liquid Drying by Adsorption: Theory & Practice

For enquiries regarding adsorption and catalyst based drying systems please get in touch with us through the Questionnaires page. Alternately, you can send an email to the following addresses:

dipaksheth@newmultifabengineers.com

sbumarji@newmultifabengineers.com

A partial list of some Adsorption and Catalysis systems designed and installed by us is given here:

(A) GAS DRYING, PURIFICATION & SEPARATION

1. ARGON PURIFICATION & DRYING: NEW PLANT FOR ASHA AEROCHEM, PITHAMPUR.

Impurities like O2, H2, H2O etc. are each reduced to less than 5 ppmv.

2. AIR PURIFICATION: TROUBLE –SHOOTING FOR NRC, KALYAN.

CO2 from air is reduced from 400 to less than 1 ppmv after trouble-shooting.

3. HYDROGEN PURIFICATION: NEW PLANT FOR BOMBAY OIL, BHANDUP. AND AARTI INDUSTRIES, DOMBIVLI

O2 and Hg are reduced to less than 1ppm and 1ppb respectively.

4. PROPANE-PROPYLENE SEPARATION: DEVELOPMENT WORK FOR HERDILLIA CHEMICALS, THANE.

Bulk separation process development to find an option to distillation.

5. PSA OXYGEN: PROCESS OPTIMISATION AND REGENERATION OF MOLECULAR SIEVES FOR GASTECH CORP., PUNE.

Reuse of 3-4 years old molecular sieves and cost savings.

6. VSA OXYGEN: REVAMP AND REGENERATION OF MOLECULAR SIEVES FOR PUNJAB CHEMICALS, CHANDIGARH

Reuse of 3-4 years old molecular sieves and cost savings.

(B) LIQUID DRYING/ PURIFICATION:

1. BENZENE DRYER: REVAMP/EXPANSION FOR SRIMAN ORGANIC, TARAPUR. AARTI INDUSTRIES, VAPI ; HINDUSTAN ORGANIC, RASAYANI. AND SUPARNA CHEMICALS, AMBERNATH.

Reduction in water content from 500-1000 to less than 20 ppmw.

2) TOLUENE DRYER: EXPANSION/OPTIMISATION FOR VINATI ORGANIC, MAHAD. NEW PLANT FOR GANESH BENZOPLAST, TARAPUR.

Reduction in water content from 500-1000 to less than 20 ppmw.

3) ETHYL ALCOHOL DRYER: NEW PLANTS FOR UNITED PHOSPHOROUS, VAPI. KEDIA CHEMICALS, THANE , INDUSTRIAL SOLVENTS, ANKLESHWAR. AND INDIA GLYCOLS , KASHIPUR, UP REVAMP FOR STERLING CHEMICALS, PUNE.

Reduction in water content from 5-8 to less than 0.1-0.5 % w.

4) DIETHYL ETHER DRYER: REVAMP AND A NEW PLANT FOR WOCKHARDT, ANKLESHWAR AND NEW PLANT FOR NICHOLAS PIRAMAL, THANE

Reduction in water content from 1 to less than 0.1 % w.

5) ETHYL ALCOHOL-ETHYL ACETATE DRYER: NEW PLANT FOR WOCKHARDT, ANKLESHWAR

Reduction in water content from 1 to less than 0.1 % w.

6) HHT DRYER: REVAMP FOR HERDILLIA CHEMICALS, THANE.

Reduction in water content from 100 to less than 20 ppmw.

7) IPA-METHANOL DRYER: NEW PLANT FOR RUPAL CHEMICALS, TARAPUR.

Reduction in water content from 2 to less than 0.1%w.