Council of Scientific and Industrial Research

Mumbai University Institute of Chemical Technology

Vivek Vinayak Ranade

Amol Arvind Kulkarni

Ashutosh Anant Kelkar

Vilas Hari Rane

Anil Kisan Kinage

Savita Kiran Shingote

Lalita Sanjib Roy

Vinay Manoharrao Bhandari

Dhananjay Ravindra Mote

Rajachandran Madhan

Anirudh Bhalchandra

Krishnamurthy Pilarisetty Venkat

Dandayudapani Ilangovan

Subhash Shivram Sawant

Arga Chandrashekar Anil

Madhan Rajachandran

Ilangovan Dandayudapani

Anirudh Bhalchandra Pandit

Agra Chandrashekar Anil

Anil Arga Chandrashekhar

Pilarisetty Venkat Krishnamurthy

The present invention discloses a process for recovery and regeneration of rare earth metals or salts thereof used as catalyst and which is conveniently integrated within the overall flow sheets of manufacturing dialkyl carbonates. Alkyl carbamate, alcohol and a rare earth metal salt as catalyst selected from the lanthanide series are added in a reactor to afford dialkyl carbonate. The rare earth metal catalyst is selected from samarium, cerium, lanthanum, neodymium, ytterbium, europium and gadolinium. Ammonia is added to a portion of the reaction mixture to precipitate the catalyst and the separated deactivated catalyst is dissolved in acid to afford regenerated catalyst, e.g., in triflic acid in the case of samarium triflate catalyst.

Process for recovery and regeneration of deactivated catalysts used in dialkyl carbonate synthesis

A multimodal micromixer obstacle for intensification of mixing and performing the reaction in a continuous manner is disclosed herein. The micromixercomprises of plurality of inlets, an outlet and a plurality of channels. The end channels&#x2014;of the channels, have plurality&#x2014;of converging sections having width, to depth ratio ranging 1:1 to 20:1. The intermediate channels have at least, one obstacle having non-circular shape. Each converging section is incomplete ellipse, prolate or oblate shaped having, angle of curvature in the range of 90 to 270&#xb0;. Axes of the inlets are coplanar and perpendicular to the channels. All the components of the micromixer are coplanar.

Continuous micro mixer

The invention relates to synthesis of methyl carbamate (MC) and dimethyl carbonate (DMC) in presence of stripping inert gas or superheated methanol vapors using packed column reactor and bubble column reactor.

Synthesis of methyl carbamate and dimethyl carbonate (DMC) in presence of stripping with inert gas or superheated vapours and a reactor for the same

The present invention discloses an improved catalyst free process for synthesis of alkyl carbamates in an integrated system comprising a tubular reactor and a striper. The process comprises reacting urea and an alcohol in said tubular reactor under autogeneous pressure; wherein said process provides &#x3e;90% selectivity towards alkyl carbamate. The mixture of urea and alcohol is N fed to the tubular reactor at a particular feed rate. The tubular reactor is heated externally under autogeneous pressure to carry out a synthesis reaction producing alkyl carbamate and ammonia. The ammonia is removed from the tubular reactor by the striper. The tubular reactor and the stripper are arranged in series to reduce the equilibrium limitations of the reaction and drive the reaction in forward direction.

Configuration and its use in process for synthesis of alkyl carbamates from alkyl alcohol and urea in a tubular reactor

The patent discloses a process for the synthesis of dialkyl carbonates catalyzed by a catalyst composition AB oxides, wherein A and B are rare earth metals or A and B are combination of rare earth and transition metals with ratios ranging from 0.5:10 to 10:0.5.

Process for the synthesis of dialkyl carbonates

The invention discloses a glass lined metal micro-reactor with enhanced heat transfer efficiency in continuous flow operation. More particularly, the invention discloses a glass lined micro-reactor that can be reassembled. The invention provides a novel glass lined metal micro-reactor with micro fluidic channels that provide a better mixing, better heat exchange, and better temperature control. The micro fluidic channels machined in the glass lined metal reactor/mixer may be straight, curved, lamellar, flower shaped, or spiral such that the cross sectional area of the micro fluidic channel is configured to suit the cross sectional area of the micro-reactor.

Glass lined metal micro-reactor

A tube in tube continuous glass lined metal reactor includes: concentric tubular segments; (a) outer glass lined tube and (b) an inner glass lined segment disposed in the outer glass lined tube, defining thereby an intermediate glass lined region between the inner segment and the outer tube.

Tube in tube continuous glass-lined reactor

The invention relates to synthesis of methyl carbamate (MC) and dimethyl carabonate (DMC) in presence of stripping inert gas or superheated methanol vapors using packed column reactor and bubble column reactor.

A method for treating effluent provides the effluent as an input to an apparatus having a vortex diode with aeration. The apparatus induces a cavitation assisted with aeration for the high rates of ammoniacal nitrogen in an orifice and the vortex diode with or without inserts/stabilizers to generate radicals, which reduce ammoniacal nitrogen of wastewater effectively during effluent treatments.

Apparatus and method for reduction in ammoniacal nitrogen from waste waters

The present invention discloses a flow reactor composed of plurality of modular/fluidic components that helps retain agility and re-configurability of the continuous chemical processes with improved processing ability. More specifically, disclosed herein is a continuous flow reactor composed of varied permutations and combinations of a plurality of modular/fluidic components for chemical processing. The components are connected to each other using connectors that facilitate the connection of either with two or more, similar or different components.

Continuous modular reactor

The present invention discloses device that can generate a strong vortex in the vortex chamber which significantly enhances rate of reactions and effectiveness of waste water treatment. The present invention disclose vortex diodes with or without inserts/stabilizers as continuous flow reactors to induce cavitation to generate radicals which reduces Chemical Oxygen Demand (COD), ammoniacal nitrogen and color of waste water effectively in effluent treatments.

Vortex diodes as effluent treatment devices

The invention disclosed provides an apparatus and method for filtration and disinfection of ship's ballast water, such as sea water, based on hydrodynamic cavitation. The apparatus comprises a vortex diode with a tangential entry port and an axial outlet port with single or multiple bleeding holes. The disinfected water may be re-circulated through the system for additional disinfection or released from the tank into the surrounding waterways. The disinfection of seawater/ship's ballast water is achieved through filtration and hydrodynamic cavitation and the method does not involve use of any chemicals or any chemical reaction. The invented apparatus and method is simple, eco-friendly and can be fitted on to existing intake and discharge systems of any ship with minor modifications. It poses no risk to the health of the ship's crew unlike chemical methods and requires no special skill or additional manpower for its operation. The apparatus and method is capable of effectively sterilizing hazardous organisms contained in ballast water stored in a ballast tank.

Growing community of inventors

Pune, India

Vivek Vinayak Ranade