Dear Ricardo,

I suggest going to www.espacenet.com, if you enter the name "hydrotalcite" and simultaneously limit the search to the firms (as applicants) you will be able to find the patented methods use by these firms.

The origonal documents generally downloadable. If you have problem and I can help more please do not hesitate to contact with me.

Dear Ricardo, I suggest going to www.espacenet.com, if you enter the name "hydrotalcite" and simultaneously limit the search to the firms (as applicants) you will be able to find the patented methods use by these firms. The origonal documents generally downloadable. If you have problem and I can help more please do not hesitate to contact with me.

Dear Ricardo, I suggest going to www.espacenet.com, if you enter the name "hydrotalcite" and simultaneously limit the search to the firms (as applicants) you will be able to find the patented methods use by these firms. The origonal documents generally downloadable. If you have problem and I can help more please do not hesitate to contact with me.

Hydrotalcite is prepared using aluminum hydroxycarbonate ( carbonate reacted with aluminium sourcw ) and magnesium hydroxide.Both precursors are subjected to hydrothermal treatment at higher pressure. We have developed and transfered technology to multination from waste source of aluminium and carbonate.

Hi, I am also looking for data regarding hydrotalcite production processees to compare their greenhouse gas emissions. Does anyone know where could I find some generic data- specifically regarding energy use in the process.

Hydrotalcite can be produced different routes including use of CO2 as raw material as a source of carbonate. 650 kWh/day is used to produce 1 t/d hydrotalcite using sea bittern as a source of Mg and Alum ( Al ). Furthermore, 7 tonnes of steam is used for the same capacity.

Thank you. Is there a source I can cite for the values of energy you gave me ? Also, do you think most of the pathways (I am using the below mentioned pathways for my model) would be using more or less same amount of energy for production ? As of now, I have assumed that this production process is similar to Bayers process and have used those energy values for production.

Equation 1, Nitrate Route:

6Mg(NO3)2 + 2Al(NO3)3 + Na2CO3 + 16NaOH + 4H2O  Mg6Al2(OH)16•4H2O + 18NaNO3

Equation 2, Chloride Route:

6MgCl2 + 2AlCl3 + Na2CO3 + 16NaOH + 4H2O  Mg6Al2(OH)16•4H2O + 18NaCl

Equation 3, Sulfate Route:

6MgSO4 + Al2(SO4)3 + Na2CO3 + 16NaOH + 4H2O  Mg6Al2(OH)16•4H2O + 9Na2SO4

Different pathways would generate several types of effluents in a typical process, i.e. NaNO3, NaCl ,Na2SO4. Selection of the process and raw materials decides environmental sustainability and shape the greener process. The effluents generated in route 1 and 3 (NaNO3 and Na2SO4 ) are not environmentally friendly and must be recovered and add the additional cost for the recovery before discharging. Route 2 leads towards greener process process. Bayer process is totally different. It is used for Aluminum extraction by Al(OH)3 using bauxite mineral and preparing Sodium aluminate as intermediate which is high energy consuming process. However, It is possible to produce SHT( Synthetic hydrotalcite) using sodium aluminate or Al(OH)3 / aluminum oxide . I would like to prefer to produce SHT from sodium aluminate using aluminum(Al) source because aluminum oxide is produced in a high temperature rotary kiln by calcination of Al(OH)3 and NaOH produced during reaction can be recycled. Another way is to produce SHT using bauxite residue liquor generated during Bayer process as a source of aluminium as sodium aluminate.

I have developed a process for preparation of SHT using effluents generated as aluminium chloride and ammonium carbonate produced in pthalocyanin pigment plant for Heubach Color Pvt. Ltd; Ankaleshwar, India – leading manufacturer of organic pigments. Magnesium part of the product can be taken from the bittern- mother liquor left out after recovery of salt from brines. The process was developed and transferred. A 1000 tonnes per year plant is designed, installed, and finally, inaugurated by the Mr. Rainer Heubach, Chairman of the company during October 2012. A PCT patent is filed for the invention. International Application No. PCT/IN2014/033760 A1 , 6 th March 2014

I have given utilities values based on scale up data on 20 kg/batch using alum ( Al) and bittern ( Mg) and almost similar values are obtained as described above process.

This is speciality chemical and it requires stringent process parameters and not simple as described in overall equations.

Thank you so much sir. That helps me understand the chemical better.