what is chloralkalic process ?give an equation

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The chlor-alkali process is the reaction in which chlorine gas and an alkali is produced.

The chloralkali process (also chlor-alkali and chlor alkali) is an industrial process for the electrolysis of NaCl. It is the technology used to produce chlorine and sodium hydroxide (caustic soda), which are commodity chemicals required by industry. 35 million tons of chlorine were prepared by this process in 1987. The equation for the chloralkali process is as follows 2NaCl + 2H2O —> 2NaOH + Cl2 + H2.

it is a process in which chlorine gas is passed through dry slaked lime at 30C - 35C.
                       
                   Ca(OH)₂  +  Cl₂ gives CaOCl_​​2  +  H₂O

The term chlor-alkali refers to the two chemicals (chlorine and an alkali) which are simultaneously produced as a result of the electrolysis of a saltwater.
                                                                         The most commonchlor-alkali chemicals are chlorine and sodium hydroxide (caustic soda) but can include potassium hydroxide and muriatic acid. There are 3 types of electrolytic processes used in the production of chlorine and caustic soda: the diaphragm cell process, the mercury cell process, and the membrane cell process.
                     In the mercury cell process, chlorine and sodium hydroxide are produced simultaneously by electrolyzing seawater (sodium saltwater or brine) in a mercury cell.
                        Note that when a potassium brine is used, potassium hydroxide is produced instead of the more usual sodium hydroxide        

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