please answer a and b

The synthesis of ethyl chloride (Product C) is accomplished by reacting ethylene (Feed A) with hydrogen chloride (Feed B) in the presence of an aluminum chloride catalyst as shown in Figure 2. The reaction is exothermic, and if the heat of reaction is not removed in some way the reactor temperature could increase to an undesirably high level. To avoid this occurrence, the reaction is carried out with the catalyst suspended in liquid ethyl chloride. As the reaction proceeds, most of the heat liberated goes to vaporize the liquid, making it possible to keep the reaction temperature at or below than 50C. The stream leaving the reactor contains ethyl chloride formed by reaction and that vaporized in the reactor. This stream passes through a condenser where it is cooled to 2C, condensing essentially all of the ethyl chloride and leaving only unreacted gas (Product D). Table 1 lists all the possible elements with their transfer function involved in process control for this synthesis. (Sintesis elll klortda (Produk C) dijulurnkun dengun tinduthbalos, antara ctilena (Ssapan A) dengan hidrogon klarida (Ssapan B) dengan kehadiran pemangkin aluminhum klorida sebagaimana dituryjukkan dalam Rajah 2. Tind dakbalas addalah luah haba, dan sekiranya haba timdakbalas tidak dipindahtan dalans beberapa cara suhu reaktor akan meningkat kepada tahap tidak diingini yang tinggi. Untuk mengelakkan kesan ini, tindakbalas dijalankan dengan pemangkin terampai dalam cecatr etil klorida. Semasa tindakbulas berlaku, kebanyakan haba dibebaskan dengan mengewapkan cecair, menjadikan ia mung kin wntuk menetapkan suhu tindakbalas pada atau di bawah 50C. Aliran yang meningsalkan reahtor mengandung etil klorida yang dibentuk oleh tindakbalas dam menjadi wap di dalam di dalam realtor. Aliran int melalui penyejal di mana ia disejuk ke suhu 2C, menyejathan kesemua etil klorid dan meninggalkan harya gas tidak bertindakbalas (Praduk D). Jadual 1 menyemaraikan semta elemen-elemsen yang mungkin terlibat berserta rangkap pindah mereka dalam kawalan proses bagi sintesis inl.] Fe Fe Figure 2: Schematic diagram of ethyl chloride synthesis [Rajah 2: Gambur rajah skema sintesis etll klorida] Table 1 List of possible elements and their transfer function for process control JJadual I Senarai elemen-elemen vang mungkin beserta rangkap pindah mereka bagi kawalan prose. (a) Based on Table 1, select the area that needs to be upgraded to an automatic system. Justify your selection. [Berdasarkan Jadual 1, pilih kavasan yang perlu dinaik-taraf kepada sistem autamatik. Justifikasilan pillhan anda.] (10 Marks/ Markah) (b) Based on (a), sketch and describe the response produced. Assume that the set point is in unitstep functions. [Berdasarkan (a), lakarkan dan huraikan sambutan yang dihasilkan. Andaikan titik set adalan fingsi unit rangkap.] (10 Marks/ Markah)