Teknik KimiaUniversitas Brawijaya

Hypochlorite electrolysers

www.themegallery.com

Teknik Elektrokimia

Dosen : Vivi Nurhadianty

Teknik Kimia UB

PENDAHULUAN

Kuliah

kePokok Bahasan Sub Pokok Bahasan

Jenis Kegiatan

Pembelajaran

Bentuk

Tugas

Taksonomi

1 2 3 4 5 6

9. Water Purification Hypochlorite on site electrolyser Kuliah, diskusi

10. Water Purification Electrodialysis

Other process

Kuliah, diskusi

11. Metal Finishing Electroplating Kuliah, diskusi

12. Metal Finishing Electrophoretic painting

Other process

Kuliah, diskusi

13. Electrochemical sensor

and monitoring technic

Polarography to anodic stripping

voltammetry

Kuliah, diskusi

14. Electrochemical sensor

and monitoring technic

Portable device

Electrochemical biosensor

Kuliah, diskusi Tugas

mandiri

15. Kuis 2 (materi 8 s/d 14)

UJIAN AKHIR SEMESTER (UAS)

Teknik Kimia UB

Hypochlorite electrolysers

Beberapa proses elektrokimiamenghasilkan oksidan dapat digunakanpada aliran purify water

Agen pengoksidasi yang paling umum dantelah dikenal cukup lama adalahhypochlorite dan chlorine

Aplikasi cukup luas yaitu di effulenttreatment industry, sterilization water for food process and hospital laundries, treatment of cooling water

Teknik Kimia UB

EXPERIMENTAL

A bench scale setup with a length of 250 mm and an outer diameter of 200 mm was fabricated to assess the NaOCl production capability of the prototype cell from seawater (salem, et al. 2012)

Figure 1. Schematic of sodium hypochlorite production electrochemical set-up (not to scale)

Teknik Kimia UB

EXPERIMENTALIn each batch experiment 3,000 ml of seawater was utilized while the temperature was maintained between 25 to 26 C. Each experimental run continued for at least 2.5 h. Seawater samples were collected from the cell every 20 min and transported to the laboratory for NaOCl concentration determination (salem, et al. 2012)

Teknik Kimia UB

Electrolyzed Water

1. Hasil uji menunjukkan bahwa EOW dapat diaplikasikan

sebagai antiseptik yang memiliki kemampuan membunuh

bakteri lebih baik daripada Sodium hypochlorite.

2. Cyclic voltammogram menunjukkan bahwa reaksi pada

produksi EOW adalah irreversibel.

3. Potensial yang digunakan yaitu berkisar 2 V terhadap

elektroda Ag/AgCl, cukup efektif menghasilkan EOW dengan

tidak adanya produk samping.

4. Reaksi pada produksi EOW adalah sebagai berikut,

Cl- teroksidasi menjadi Cl2 pada -0,9 V terhadap elektroda

Ag/AgCl

2 Cl- Cl2 + 2e-

oksidasi Cl2 menjadi HClO pada 1 V terhadap elektroda

Ag/AgCl

Nurhadianty, dkk. 2011

Teknik Kimia UB

Saat ini dikenal sebagai by product chloralkali industry.

Material katoda : stainless stell, nikel, atautitanium

Material anoda : graphite, titanium (Dimensionally Stable Anoda)

Energy konsumsi : 3,7 kWh/kg

Current densitas : 0,1 0,5 A /cm2

Umumnya menggunakan parallel plate geometry

Hypochlorite electrolysers

Teknik Kimia UB

Dimensionally Stable Anodes

Dimensionally stable anodes (DSA) were developed in the mid-1960's for

the chlor-alkali industry. They are called dimensionally stable because

they utilize precious metal containing electrocatalysts, like RuO2,

coated on titanium. The titanium substrate is corrosion resistant in the

chlorine generating environment which allows for the structure to maintain

its dimensional tolerance during its life unlike the graphite anodes they

replaced. Since their introduction into the chlor-alkali industry, DSAs have

found economic application in chlorate generation, water disinfection, pool

chlorinators, organic destruction, electrogalvanizing, electrotinning and

metal plating.

Teknik Kimia UB

Industrial process

Teknik Kimia UB

Hypochlorite electrolysers

Teknik Kimia UB

Hypochlorite electrolysers

Teknik KimiaUniversitas Brawijaya