TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: The process (P1) further involves: c) activating the dechlorinated adsorbent to provide a rejuvenated adsorbent; and (d) after step (c), contacting the rejuvenated adsorbent with a hydrocarbon product in an adsorption zone to provide the spent adsorbent, and after step (d), sequentially repeating steps (a)-(d). In the process (P1), step a) involves washing a bed of the spent adsorbent with at least one bed volume of the basic solution; feeding the basic solution up-flow or down-flow through a bed of the spent adsorbent; and circulating the basic solution through a rejuvenation sub-system comprising a bed of the spent adsorbent and a reservoir of the basic solution. The adsorbent dechlorination conditions comprise a temperature of 35-200 degrees F, a pressure of 1-400 psig, and a liquid hourly space velocity (LHSV) feed rate of 0.1-100 hr-1. The step (c) involves exposing the dechlorinated adsorbent to a temperature of 100-1000 degrees F at a pressure of 1-400 psig for a time period of 0.5-24 hours. A second alkyl chloride adsorption capacity of the rejuvenated adsorbent is at least 30% of a first alkyl chloride adsorption capacity of a fresh adsorbent. In the process (P2), the organic halide adsorption conditions comprise a temperature of 32-500 degrees F, a pressure of 1-1000 psig, and a liquid hourly space velocity (LHSV) feed rate of 0.1-40 hr-1. The adsorbent dechlorination conditions comprise a temperature of 35-200 degrees F, a pressure of 1-400 psig, and a liquid hourly space velocity (LHSV) feed rate of 0.1-100 hr-1, and step (c') includes exposing the dechlorinated adsorbent to a temperature of 100-1000 degrees F at a pressure of 1-400 psig for a time period of 0.5-24 hours. The step (b') involves feeding the basic solution through a bed of the spent adsorbent, where a ratio (VS/VB) of basic solution volume (VS) to adsorbent bed volume (VB) is 1-1000. In the process (P3), the organic halide adsorption conditions comprise a temperature of 32-500 degrees F, a pressure of 1-1000 psig, and a liquid hourly space velocity (LHSV) feed rate of the hydrocarbon product to the adsorption zone of 0.1-40 hr-1; the adsorbent dechlorination conditions include a temperature of 35-200 degrees F, a pressure of 1-400 psig, and a liquid hourly space velocity (LHSV) feed rate of 0.1-100 hr-1; and step (d1) involve exposing the dechlorinated adsorbent to a temperature of 100-1000 degrees F at a pressure of 1-400 psig for a time period of 0.5-24 hours. The hydrocarbon reactant comprises a first reactant having 4-10C isoparaffin and a second reactant containing 2-10C olefin, where the hydrocarbon product comprises alkylate gasoline, the ionic liquid catalyst comprises a chloroaluminate ionic liquid, the adsorbent comprises a molecular sieve, and the basic solution comprises aqueous sodium hydroxide (NaOH). Preferred Components: The basic solution comprises a solution of a material selected from NaOH, potassium hydroxide (KOH), rubidium hydroxide (RbOH), cesium hydroxide (CsOH), magnesium hydroxide (Mg(OH)2), calcium hydroxide (Ca(OH)2), strontium hydroxide (Sr(OH)2), and/or barium hydroxide (Ba(OH)2).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The basic solution comprises an aqueous solution of a Group 1 or Group 2 metal hydroxide. The basic solution comprises NaOH solution (0.01-10 M). The halogenated component of the spent adsorbent comprises an organic halide adsorbent (preferably 2-16C alkyl chloride). EXAMPLE - No suitable example is given.