Council of Scientific and Industrial Research

Subarna Maiti

Pushpito Kumar Ghosh

Pratyush Maiti

Pankaj Ramanbhai Patel

Mahesh Ramniklal Gandhi

Sumesh Chandra Upadhyay

Soumya Haldar

Jitendra Narsinhbhai Bharadia

Prasanta Kumar Das

Arup Kumar Siddhanta

Kamalesh Prasad

Dibyendu Mondal

Rachapudi Badari Narayana Prasad

Krishna Kanta Ghara

Mahesh Ramjibhai Gajjar

Imran Pancha

Sandhya Chandrika Prasad Mishra

Anupama Vijaykumar Shrivastav

Sanjiv Kumar Mishra

Milan Dinda

Sanjit Kanjilal

Arup Ghosh

Supratim Chakraborty

Chitrangi Bankimbhai Bhatt

Pankaj Arvindbhai Patel

Pratap Sashikant Bapat

Samir Kumar Kanjibhai Charola

Pratap Shashikant Bapat

Neha Pratap Patel

Deepti Jain

Bhumi Shethia

Krushnadevsinh Sukhdevsingh Zala

Chitrangi BankimBhai Bhatt

Bharti Gunvantray Shah

Hetal Bosamiya

Shailesh Kumar Patidar

Tonmoy Ghosh

Krushnadevsinh Zala

Abhishek Sahu

Rahul Kumar Maurya

Chetan Paliwal

Sourish Bhattacharya

The present invention provides a method for the preparation of multi-nutrient potassic fertilizer, by recovering potassium from sugarcane molasses based alcohol distillery effluent (commonly known as 'spent wash'). The process involves pre-treatment of spent wash to clarify the aqueous phase and utilization of the treated spent wash in production of potassic fertilizer. The present invention enables utilisation of spent wash for recovery of value-added product (viz., potash fertiliser of &#x3e;99% purity) and improves ease of 'Zero Liquid Discharge' compliance by subjecting the relatively benign process effluent to industrially practiced techniques for water recovery and salt reclamation.

Process for the preparation of potassic fertiliser from alcohol distillery effluent (spent wash)

Molasses based alcohol distilleries generate highly contaminated, dark coloured and foul smelling effluent (bio-methanated spent wash, BMSW, also known as post methanated effluent). While the prevailing practices for treatment of alcohol distillery effluents operate on the premises of 'liability management', high potassium content of spent wash (ca. 2% w/v in BMSW) offers an opportunity for its utilisation in production of potash fertilizers&#x2014;a major agricultural input. The present invention provides process for potash recovery from BMSW with concomitant environmental remediation of effluent. The process involves pre-treatment of BMSW followed by potash recovery through selective precipitation technique to produce potash fertilizers and activated carbon while generating a relatively benign effluent (&#x3e;80% remediation). It may further be possible for the alcohol distilleries to achieve ZLD status by incorporating commercially practiced water recovery techniques (viz., multiple effect evaporation/nano-filtration/reverse osmosis etc.) for downstream processing of the process effluent.

Process for potash recovery from biomethanated spent wash with concomitant environmental remediation of effluent

The invention discloses the design of an improved household solar still with enhanced output and high recovery. The output and recovery are enhanced by (i) aligning the top glass and basin so as to maximize the input solar radiation, (ii) using North-South reflectors in V trough configuration to further raise the incident radiation, (iii) employing metallic condensers on sides to maximize condensation efficiency, (iv) using suitably heated and cooled saline water by taking advantage of ambient temperature differential during a day and using such water as feed water and condenser water respectively. Use of detachable top glass assembly and teflon cork at the bottom allows for easy cleaning of the interior of the still and discharge of concentrate, respectively. The still is also demonstrated to be useful for other applications where, besides producing distilled water, the concentrate is a more value added product than the feed.

Household solar still with easy operation and maintenance and enhanced output

The invention relates to an integrated process for the production of 5-hydroxymethyl furfural (HMF), KSO, levulinic acid and formic acid from &#x3ba;-carrageenan, the latter being obtained from freshseaweed biomass after expelling the juice. Mg(HSO)was used in HMF synthesis, with co-production of galactose. The aqueous stream after HMF extraction was treated with the seaweed juice which process facilitated recovery of KSOin pure form. The galactose may be utilised for synthesis of levulinic acid and formic acid before or after KSOrecovery or, alternatively, utilised for other purposes. Catalysts required in the synthetic reactions are generated in the process itself while the process energy required is met out of additional supplies of the seaweed biomass which is subjected to combustion/gasification.

Process for improved seaweed biomass conversion for fuel intermediates, agricultural nutrients and fresh water

A process conducts organic reactions in a standalone laboratory scale solar photo thermo chemical reactor. For organic reactions require elevated temperature, light and mechanical agitation, all three energy forms can be simultaneously derived from solar radiation. Organic synthesis, such as bromination of toluene derivatives (benzylic bromination), bromination of cyclic acyclic hydrocarbon and oxidative cyclization of N-phenylethyl benzamide through bromination were successfully conducted in such reactors.

Process for conducting organic reactions in a standalone and affordable laboratory scale solar photo thermochemical reactor

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Gujarat, India

Subarna Maiti