Council of Scientific and Industrial Research

National Chemical Laboratory

Sudhir Sharadchandra Kulkarni

Mohan Gopalkrishna Kulkarni

Sanjay Narayan Nene

Bhaskar Ganapatrao Gaikwad

Madhav Jagannath Thakar

Ulhas Kanhaiyalal Kharul

Jayarani Purushotham

Arun Savalaram Jadhav

Subhash Pundalik Vernekar

Madhuri Himmatrao Shinde

Deepak Anandrao Musale

The present Application relates to a process for the preparation of ultrafiltration membranes from polyacrylonitrile using malic acid as additives, with said membrane of molecular weight ranging between 80 to 180K, showing high purification and water permeating ability.

Process for the preparation of ultrafiltration membranes of polyacrylonitrile, using malic acid as an additive

This invention relates to a process for the preparation of aromatic polyesters which comprises polymerization of a aromatic dicarboxylic acid substituted with a polar group weight percentage in the range of 20 to 75 with a substituted aromatic diol weight percentage in the range of 25 to 78 by known method herein described.

Process for the preparation of aromatic polyesters

The invention relates to a novel process for the recovery of potassium bitartrate and pectin, sugars, fruit acids as by-products from tamarind pulp.

Process for the recovery of potassium bitartrate and other products from tamarind pulp

The invention provides Potassium bitartrate, pectin, L(+) tartaric acid and fruit sugars present in tamarind pulp, which are recovered sequentially by extracting the pulp in water, concentrating and chilling the extract, filtering out potassium bitartrate, precipitating out pectin from the filtrate by addition of acetone, extracting L(+) tartaric acid selectively by complexation with tertiary amine and recovering from the amine layer by back extraction into aqueous layer in the presence of a diluent at around 70.degree. C. followed by concentration and drying of the aqueous layer and treating the raffinate layer from solvent extraction with activated carbon, anion exchange resin, and concentrating to yield sugar containing 70% sugars.

Process for the recovery of tartaric acid and other products from

The present invention provides novel silicon containing polyarylates of Formula I ##STR1## where R.sub.1 to R.sub.8 represent hydrogen, alkyl groups containing 1 to 5 methylene group or halogen atoms, R.sub.9 and R.sub.10 represents alkyl groups containing 1 to 5 carbon atoms or CF.sub.3 group and R.sub.11 and R.sub.12 represent alkyl groups with 1 to 5 carbon atoms or phenyl groups.

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Maharashtra, India

Sudhir Sharadchandra Kulkarni